STS131-S-088 (20 April 2010) --- The space shuttle Discovery is seen as it lands at the Kennedy Space Center in Cape Canaveral, Florida, on April 20, 2010. Discovery and the STS-131 mission crew, NASA astronauts Alan Poindexter, commander; James P. Dutton Jr., pilot; Dorothy Metcalf-Lindenburger, Rick Mastracchio, Stephanie Wilson, Clayton Anderson and Japanese astronaut Naoko Yamazaki, all mission specialists, returned from their mission to the International Space Station. Photo credit: NASA/Bill Ingalls

NASA Deputy Administrator Lori Garver and STS-131 Commander Alan G. Poindexter walk around under the space shuttle Discovery shortly after Discovery and the STS-131 crew landed at the Kennedy Space Center in Cape Canaveral, Fla., Tuesday, April 20, 2010. STS-131 mission crew, Commander Alan G. Poindexter, Pilot James P. Dutton Jr. and Mission Specialists Dorothy Metcalf-Lindenburger, Rick Mastracchio, Stephanie Wilson, Clayton Anderson and Japanese astronaut Naoko Yamazaki returned from their 14-day journey of more than 6.2 million miles. The STS-131 mission to the International Space Station delivered science racks, new crew sleeping quarters, equipment and supplies. Photo credit: (NASA/Bill Ingalls)

STS131-S-091 (20 April 2010) --- NASA Deputy Administrator Lori Garver and NASA astronaut Alan Poindexter, STS-131 commander, walk around under the space shuttle Discovery shortly after Discovery and its seven-member crew landed at the Kennedy Space Center in Cape Canaveral, Fla., on April 20, 2010. Poindexter and NASA astronaut James P. Dutton Jr., pilot; along with NASA astronauts Dorothy Metcalf-Lindenburger, Rick Mastracchio, Stephanie Wilson, Clayton Anderson and Japanese astronaut Naoko Yamazaki, all mission specialists, returned from their 15-day journey of more than 6.2 million miles. The STS-131 mission to the International Space Station delivered science racks, new crew sleeping quarters, equipment and supplies. Photo credit: NASA/Bill Ingalls

The space shuttle Discovery is seen as it lands at the Kennedy Space Center in Cape Canaveral, Florida, Tuesday, April 20, 2010. Discovery and the STS-131 mission crew, Commander Alan G. Poindexter, Pilot James P. Dutton Jr. and Mission Specialists Dorothy Metcalf-Lindenburger, Rick Mastracchio, Stephanie Wilson, Clayton Anderson and Japanese astronaut Naoko Yamazaki returned from their mission to the International Space Station. Photo credit: (NASA/Bill Ingalls)

STS131-S-086 (20 April 2010) --- The space shuttle Discovery is seen as it lands at the Kennedy Space Center in Cape Canaveral, Florida, on April 20, 2010. Discovery and the STS-131 mission crew, NASA astronauts Alan Poindexter, commander; James P. Dutton Jr., pilot; Dorothy Metcalf-Lindenburger, Rick Mastracchio, Stephanie Wilson, Clayton Anderson and Japanese astronaut Naoko Yamazaki, all mission specialists, returned from their mission to the International Space Station. Photo credit: NASA/Bill Ingalls

The space shuttle Discovery is seen as it lands at the Kennedy Space Center in Cape Canaveral, Florida, Tuesday, April 20, 2010. Discovery and the STS-131 mission crew, Commander Alan G. Poindexter, Pilot James P. Dutton Jr. and Mission Specialists Dorothy Metcalf-Lindenburger, Rick Mastracchio, Stephanie Wilson, Clayton Anderson and Japanese astronaut Naoko Yamazaki returned from their mission to the International Space Station. Photo credit: (NASA/Bill Ingalls)

STS131-S-092 (20 April 2010) --- Japanese astronaut Naoko Yamazaki, left, and Dr. Kuniaki Shiraki, Executive Director, Japan Aerospace Exploration Agency (JAXA), talk near the space shuttle Discovery shortly after Discovery and the STS-131 crew landed at the Kennedy Space Center in Cape Canaveral, Fla., on April 20, 2010. NASA astronauts Alan Poindexter, commander; James P. Dutton Jr., pilot; Dorothy Metcalf-Lindenburger, Rick Mastracchio, Stephanie Wilson, Clayton Anderson and Japanese astronaut Naoko Yamazaki, all mission specialists, returned from their 15-day journey of more than 6.2 million miles. The STS-131 mission to the International Space Station delivered science racks, new crew sleeping quarters, equipment and supplies. Photo credit: NASA/Bill Ingalls

Japanese astronaut Naoko Yamazaki, holds a Japanese flag near the space shuttle Discovery shortly after Discovery and the STS-131 crew landed at the Kennedy Space Center in Cape Canaveral, Fla., Tuesday, April 20, 2010. STS-131 mission crew, Commander Alan G. Poindexter, Pilot James P. Dutton Jr. and Mission Specialists Dorothy Metcalf-Lindenburger, Rick Mastracchio, Stephanie Wilson, Clayton Anderson and Japanese astronaut Naoko Yamazaki returned from their 14-day journey of more than 6.2 million miles. The STS-131 mission to the International Space Station delivered science racks, new crew sleeping quarters, equipment and supplies. Photo credit: (NASA/Bill Ingalls)

STS131-S-087 (20 April 2010) --- NASA Kennedy Space Center Director Bob Cabana, left, Special Assistant to the Director Robert Hubbard, center, and NASA Deputy Administrator Lori Garver scan the sky for the space shuttle Discovery as it approaches for landing at the Kennedy Space Center in Cape Canaveral, Florida, on April 20, 2010. Discovery and the STS-131 mission crew, NASA astronauts Alan Poindexter, commander; James P. Dutton Jr., pilot; Dorothy Metcalf-Lindenburger, Rick Mastracchio, Stephanie Wilson, Clayton Anderson and Japanese astronaut Naoko Yamazaki, all mission specialists, returned from their mission to the International Space Station. Photo credit: NASA/Bill Ingalls

STS131-S-093 (20 April 2010) --- Japanese astronaut Naoko Yamazaki, holds a Japanese flag near the space shuttle Discovery shortly after Discovery and the STS-131 crew landed at the Kennedy Space Center in Cape Canaveral, Fla., on April 20, 2010. NASA astronauts Alan Poindexter, commander; James P. Dutton Jr., pilot; Dorothy Metcalf-Lindenburger, Rick Mastracchio, Stephanie Wilson, Clayton Anderson and Japanese astronaut Naoko Yamazaki, all mission specialists, returned from their 15-day journey of more than 6.2 million miles. The STS-131 mission to the International Space Station delivered science racks, new crew sleeping quarters, equipment and supplies. Photo credit: NASA/Bill Ingalls

KSC WEATHER - CLOUDS & FOG WAVEOFF FOR STS-131 LANDING OPPORTUNITY 2

KSC WEATHER - CLOUDS & FOG WAVEOFF STS-131 LANDING OPPORTUNITY 1

KSC WEATHER - CLOUDS & FOG WAVEOFF FOR STS-131 LANDING OPPORTUNITY 2

KSC WEATHER - CLOUDS & FOG WAVEOFF FOR STS-131 LANDING OPPORTUNITY 2

KSC WEATHER - CLOUDS & FOG WAVEOFF FOR STS-131 LANDING OPPORTUNITY 2

KSC WEATHER - CLOUDS & FOG WAVEOFF STS-131 LANDING OPPORTUNITY 1

KSC WEATHER - CLOUDS & FOG WAVEOFF FOR STS-131 LANDING OPPORTUNITY 2

KSC WEATHER - CLOUDS & FOG WAVEOFF FOR STS-131 LANDING OPPORTUNITY 2

KSC WEATHER - CLOUDS & FOG WAVEOFF FOR STS-131 LANDING OPPORTUNITY 2

CAPE CANAVERAL, Fla. - At the Shuttle Landing Facility at NASA's Kennedy Space Center in Florida, STS-131 Launch Director Pete Nickolenko, second from right, congratulates STS-131 Commander Alan Poindexter on a successful mission following landing of space shuttle Discovery on Runway 33. Other members of the STS-131 crew are, from left, Mission Specialist Rick Mastracchio and Pilot James P. Dutton Jr. Discovery landed at Kennedy after 15 days in space, completing the more than 6.2-million-mile STS-131 mission on orbit 238. Main gear touchdown was at 9:08:35 a.m. EDT followed by nose gear touchdown at 9:08:47 a.m. and wheelstop at 9:09:33 a.m. The seven-member STS-131 crew carried the multi-purpose logistics module Leonardo, filled with supplies, a new crew sleeping quarters and science racks that were transferred to the International Space Station's laboratories. The crew also switched out a gyroscope on the station’s truss, installed a spare ammonia storage tank and retrieved a Japanese experiment from the station’s exterior. STS-131 is the 33rd shuttle mission to the station and the 131st shuttle mission overall. For information on the STS-131 mission and crew, visit http:__www.nasa.gov_mission_pages_shuttle_shuttlemissions_sts131_index.html. Photo credit: NASA_Jim Grossmann

CAPE CANAVERAL, Fla. - At the Shuttle Landing Facility at NASA's Kennedy Space Center in Florida, STS-131 Commander Alan Poindexter gets settled in the cockpit of the Shuttle Training Aircraft, or STA, in which he will practice touch-and-go landings. STS-131 will be Poindexter's second space shuttle flight. The aircraft is a Gulfstream II jet, modified to handle like the space shuttle. The crew members of space shuttle Discovery's STS-131 mission are at Kennedy for training related to their launch dress rehearsal, the Terminal Countdown Demonstration Test. The seven-member crew will deliver the multi-purpose logistics module Leonardo, filled with resupply stowage platforms and racks, to the International Space Station aboard Discovery. Targeted for launch on April 5, STS-131 will be the 33rd shuttle mission to the station and the 131st shuttle mission overall. For information on the STS-131 mission and crew, visit http:__www.nasa.gov_mission_pages_shuttle_shuttlemissions_sts131_index.html. Photo credit: NASA_Kim Shiflett

CAPE CANAVERAL, Fla. - As the sun sets at the Shuttle Landing Facility at NASA's Kennedy Space Center in Florida, preparations are under way for STS-131 Commander Alan Poindexter and Pilot James P. Dutton Jr. to practice landing this Shuttle Training Aircraft, or STA. STS-131 will be Poindexter's second space shuttle flight and Dutton's first. The aircraft is a Gulfstream II jet, modified to handle like the space shuttle. The crew members of space shuttle Discovery's STS-131 mission are at Kennedy for training related to their launch dress rehearsal, the Terminal Countdown Demonstration Test. The seven-member crew will deliver the multi-purpose logistics module Leonardo, filled with resupply stowage platforms and racks, to the International Space Station aboard Discovery. Targeted for launch on April 5, STS-131 will be the 33rd shuttle mission to the station and the 131st shuttle mission overall. For information on the STS-131 mission and crew, visit http:__www.nasa.gov_mission_pages_shuttle_shuttlemissions_sts131_index.html. Photo credit: NASA_Kim Shiflett

CAPE CANAVERAL, Fla. - At the Shuttle Landing Facility at NASA's Kennedy Space Center in Florida, STS-131 Pilot James P. Dutton Jr. gets settled in the cockpit of the Shuttle Training Aircraft, or STA, in which he will practice touch-and-go landings. STS-131 will be Dutton's first space shuttle flight. The aircraft is a Gulfstream II jet, modified to handle like the space shuttle. The crew members of space shuttle Discovery's STS-131 mission are at Kennedy for training related to their launch dress rehearsal, the Terminal Countdown Demonstration Test. The seven-member crew will deliver the multi-purpose logistics module Leonardo, filled with resupply stowage platforms and racks, to the International Space Station aboard Discovery. Targeted for launch on April 5, STS-131 will be the 33rd shuttle mission to the station and the 131st shuttle mission overall. For information on the STS-131 mission and crew, visit http:__www.nasa.gov_mission_pages_shuttle_shuttlemissions_sts131_index.html. Photo credit: NASA_Kim Shiflett

CAPE CANAVERAL, Fla. - At the Shuttle Landing Facility at NASA's Kennedy Space Center in Florida, Dr. Kuniaki Shiraki, right, executive director of the Japan Aerospace Exploration Agency, or JAXA, talks with STS-131 Mission Specialist and JAXA astronaut Naoko Yamazaki, center, following the landing of space shuttle Discovery on Runway 33. At left is STS-131 Flight Surgeon Dr. Akiko Matsumoto. Discovery landed at Kennedy after 15 days in space, completing the more than 6.2-million-mile STS-131 mission on orbit 238. Main gear touchdown was at 9:08:35 a.m. EDT followed by nose gear touchdown at 9:08:47 a.m. and wheelstop at 9:09:33 a.m. The seven-member STS-131 crew carried the multi-purpose logistics module Leonardo, filled with supplies, a new crew sleeping quarters and science racks that were transferred to the International Space Station's laboratories. The crew also switched out a gyroscope on the station’s truss, installed a spare ammonia storage tank and retrieved a Japanese experiment from the station’s exterior. STS-131 is the 33rd shuttle mission to the station and the 131st shuttle mission overall. For information on the STS-131 mission and crew, visit http:__www.nasa.gov_mission_pages_shuttle_shuttlemissions_sts131_index.html. Photo credit: NASA_Jim Grossmann

CAPE CANAVERAL, Fla. – STS-131 Commander Alan Poindexter arrives at the Shuttle Landing Facility at NASA’s Kennedy Space Center in Florida aboard a T-38 aircraft. The STS-131 crew members are at Kennedy for the Terminal Countdown Demonstration Test, or TCDT, a dress rehearsal for launch. The seven-member crew will deliver the Multi-Purpose Logistics Module Leonardo, filled with resupply stowage platforms and racks, to the International Space Station aboard space shuttle Discovery. STS-131, targeted for launch on April 5, will be the 33rd shuttle mission to the station and the 131st shuttle mission overall. For information on the STS-131 mission and crew, visit http:__www.nasa.gov_mission_pages_shuttle_shuttlemissions_sts131_index.html. Photo credit: NASA_Kim Shiflett

CAPE CANAVERAL, Fla. – STS-131 Commander Alan Poindexter arrives at the Shuttle Landing Facility at NASA’s Kennedy Space Center in Florida aboard a T-38 aircraft. The STS-131 crew members are at Kennedy for the Terminal Countdown Demonstration Test, or TCDT, a dress rehearsal for launch. The seven-member crew will deliver the Multi-Purpose Logistics Module Leonardo, filled with resupply stowage platforms and racks, to the International Space Station aboard space shuttle Discovery. STS-131, targeted for launch on April 5, will be the 33rd shuttle mission to the station and the 131st shuttle mission overall. For information on the STS-131 mission and crew, visit http:__www.nasa.gov_mission_pages_shuttle_shuttlemissions_sts131_index.html. Photo credit: NASA_Kim Shiflett

CAPE CANAVERAL, Fla. - At the Shuttle Landing Facility at NASA's Kennedy Space Center in Florida, NASA Deputy Administrator Lori Garver, left, and Kennedy Director Bob Cabana, right, welcome STS-131 Commander Alan Poindexter back to Florida following the landing of space shuttle Discovery on Runway 33. Discovery landed at Kennedy after 15 days in space, completing the more than 6.2-million-mile STS-131 mission on orbit 238. Main gear touchdown was at 9:08:35 a.m. EDT followed by nose gear touchdown at 9:08:47 a.m. and wheelstop at 9:09:33 a.m. The seven-member STS-131 crew carried the multi-purpose logistics module Leonardo, filled with supplies, a new crew sleeping quarters and science racks that were transferred to the International Space Station's laboratories. The crew also switched out a gyroscope on the station’s truss, installed a spare ammonia storage tank and retrieved a Japanese experiment from the station’s exterior. STS-131 is the 33rd shuttle mission to the station and the 131st shuttle mission overall. For information on the STS-131 mission and crew, visit http:__www.nasa.gov_mission_pages_shuttle_shuttlemissions_sts131_index.html. Photo credit: NASA_Jim Grossmann

CAPE CANAVERAL, Fla. - At the Shuttle Landing Facility at NASA's Kennedy Space Center in Florida, NASA Deputy Administrator Lori Garver welcomes STS-131 Commander Alan Poindexter back from space following the landing of space shuttle Discovery on Runway 33. Kennedy Director Bob Cabana applauds Cabana for his successful mission, at right. Discovery landed at Kennedy after 15 days in space, completing the more than 6.2-million-mile STS-131 mission on orbit 238. Main gear touchdown was at 9:08:35 a.m. EDT followed by nose gear touchdown at 9:08:47 a.m. and wheelstop at 9:09:33 a.m. The seven-member STS-131 crew carried the multi-purpose logistics module Leonardo, filled with supplies, a new crew sleeping quarters and science racks that were transferred to the International Space Station's laboratories. The crew also switched out a gyroscope on the station’s truss, installed a spare ammonia storage tank and retrieved a Japanese experiment from the station’s exterior. STS-131 is the 33rd shuttle mission to the station and the 131st shuttle mission overall. For information on the STS-131 mission and crew, visit http:__www.nasa.gov_mission_pages_shuttle_shuttlemissions_sts131_index.html. Photo credit: NASA_Jim Grossmann

CAPE CANAVERAL, Fla. - At the Shuttle Landing Facility at NASA's Kennedy Space Center in Florida, STS-131 Mission Specialist Rich Mastracchio, left, and Kennedy Director Bob Cabana are all smiles as they get a close look at Discovery following the shuttle's landing on Runway 33. Discovery landed at Kennedy after 15 days in space, completing the more than 6.2-million-mile STS-131 mission on orbit 238. Main gear touchdown was at 9:08:35 a.m. EDT followed by nose gear touchdown at 9:08:47 a.m. and wheelstop at 9:09:33 a.m. The seven-member STS-131 crew carried the multi-purpose logistics module Leonardo, filled with supplies, a new crew sleeping quarters and science racks that were transferred to the International Space Station's laboratories. The crew also switched out a gyroscope on the station’s truss, installed a spare ammonia storage tank and retrieved a Japanese experiment from the station’s exterior. STS-131 is the 33rd shuttle mission to the station and the 131st shuttle mission overall. For information on the STS-131 mission and crew, visit http:__www.nasa.gov_mission_pages_shuttle_shuttlemissions_sts131_index.html. Photo credit: NASA_Jim Grossmann

CAPE CANAVERAL, Fla. - At the Shuttle Landing Facility at NASA's Kennedy Space Center in Florida, members of the STS-131 crew are congratulated on a successful mission by NASA managers and invited guests on hand for the landing of space shuttle Discovery on Runway 33. The astronauts are, from left, Mission Specialists Stephanie Wilson, Dorothy Metcalf-Lindenburger and Rick Mastracchio; Pilot James P. Dutton Jr.; and Commander Alan Poindexter, talking with Discovery Flow Director Stephanie Stilson. Discovery landed at Kennedy after 15 days in space, completing the more than 6.2-million-mile STS-131 mission on orbit 238. Main gear touchdown was at 9:08:35 a.m. EDT followed by nose gear touchdown at 9:08:47 a.m. and wheelstop at 9:09:33 a.m. The seven-member STS-131 crew carried the multi-purpose logistics module Leonardo, filled with supplies, a new crew sleeping quarters and science racks that were transferred to the International Space Station's laboratories. The crew also switched out a gyroscope on the station’s truss, installed a spare ammonia storage tank and retrieved a Japanese experiment from the station’s exterior. STS-131 is the 33rd shuttle mission to the station and the 131st shuttle mission overall. For information on the STS-131 mission and crew, visit http:__www.nasa.gov_mission_pages_shuttle_shuttlemissions_sts131_index.html. Photo credit: NASA_Jim Grossmann

CAPE CANAVERAL, Fla. - At the Shuttle Landing Facility at NASA's Kennedy Space Center in Florida, Kennedy Director Bob Cabana congratulates STS-131 Mission Specialist Naoko Yamazaki of the Japan Aerospace Exploration Agency, at left, on a successful mission following the landing of space shuttle Discovery on Runway 33. At right is her crewmate, Mission Specialist Stephanie Wilson. Discovery landed at Kennedy after 15 days in space, completing the more than 6.2-million-mile STS-131 mission on orbit 238. Main gear touchdown was at 9:08:35 a.m. EDT followed by nose gear touchdown at 9:08:47 a.m. and wheelstop at 9:09:33 a.m. The seven-member STS-131 crew carried the multi-purpose logistics module Leonardo, filled with supplies, a new crew sleeping quarters and science racks that were transferred to the International Space Station's laboratories. The crew also switched out a gyroscope on the station’s truss, installed a spare ammonia storage tank and retrieved a Japanese experiment from the station’s exterior. STS-131 is the 33rd shuttle mission to the station and the 131st shuttle mission overall. For information on the STS-131 mission and crew, visit http:__www.nasa.gov_mission_pages_shuttle_shuttlemissions_sts131_index.html. Photo credit: NASA_Jim Grossmann

CAPE CANAVERAL, Fla. - At the Shuttle Landing Facility at NASA's Kennedy Space Center in Florida, STS-131 Commander Alan Poindexter, front, and his crew exit the crew transport vehicle following the landing of space shuttle Discovery on Runway 33. The crew received a brief preliminary medical examination before joining NASA managers and invited guests on the runway. Discovery landed at Kennedy after 15 days in space, completing the more than 6.2-million-mile STS-131 mission on orbit 238. Main gear touchdown was at 9:08:35 a.m. EDT followed by nose gear touchdown at 9:08:47 a.m. and wheelstop at 9:09:33 a.m. The seven-member STS-131 crew carried the multi-purpose logistics module Leonardo, filled with supplies, a new crew sleeping quarters and science racks that were transferred to the International Space Station's laboratories. The crew also switched out a gyroscope on the station’s truss, installed a spare ammonia storage tank and retrieved a Japanese experiment from the station’s exterior. STS-131 is the 33rd shuttle mission to the station and the 131st shuttle mission overall. For information on the STS-131 mission and crew, visit http:__www.nasa.gov_mission_pages_shuttle_shuttlemissions_sts131_index.html. Photo credit: NASA_Jim Grossmann

CAPE CANAVERAL, Fla. - At the Shuttle Landing Facility at NASA's Kennedy Space Center in Florida, Rita Willcoxon, director of Launch Vehicle Processing at Kennedy, welcomes STS-131 Commander Alan Poindexter back to Florida following the landing of space shuttle Discovery on Runway 33. Discovery landed on Runway 33 after 15 days in space, completing the more than 6.2-million-mile STS-131 mission on orbit 238. Main gear touchdown was at 9:08:35 a.m. EDT followed by nose gear touchdown at 9:08:47 a.m. and wheelstop at 9:09:33 a.m. The seven-member STS-131 crew carried the multi-purpose logistics module Leonardo, filled with supplies, a new crew sleeping quarters and science racks that were transferred to the International Space Station's laboratories. The crew also switched out a gyroscope on the station’s truss, installed a spare ammonia storage tank and retrieved a Japanese experiment from the station’s exterior. STS-131 is the 33rd shuttle mission to the station and the 131st shuttle mission overall. For information on the STS-131 mission and crew, visit http:__www.nasa.gov_mission_pages_shuttle_shuttlemissions_sts131_index.html. Photo credit: NASA_Jim Grossmann

CAPE CANAVERAL, Fla. - At the Shuttle Landing Facility at NASA's Kennedy Space Center in Florida, Kennedy Director Bob Cabana, right, congratulates STS-131 Pilot James P. Dutton Jr. on his successful mission following the landing of space shuttle Discovery. Discovery landed on Runway 33 after 15 days in space, completing the more than 6.2-million-mile STS-131 mission on orbit 238. Main gear touchdown was at 9:08:35 a.m. EDT followed by nose gear touchdown at 9:08:47 a.m. and wheelstop at 9:09:33 a.m. The seven-member STS-131 crew carried the multi-purpose logistics module Leonardo, filled with supplies, a new crew sleeping quarters and science racks that were transferred to the International Space Station's laboratories. The crew also switched out a gyroscope on the station’s truss, installed a spare ammonia storage tank and retrieved a Japanese experiment from the station’s exterior. STS-131 is the 33rd shuttle mission to the station and the 131st shuttle mission overall. For information on the STS-131 mission and crew, visit http:__www.nasa.gov_mission_pages_shuttle_shuttlemissions_sts131_index.html. Photo credit: NASA_Jim Grossmann

CAPE CANAVERAL, Fla. - At the Shuttle Landing Facility at NASA's Kennedy Space Center in Florida, STS-131 Pilot James P. Dutton Jr., left, and Kennedy Director Bob Cabana talk following space shuttle Discovery's landing. Discovery landed on Runway 33 after 15 days in space, completing the more than 6.2-million-mile STS-131 mission on orbit 238. Main gear touchdown was at 9:08:35 a.m. EDT followed by nose gear touchdown at 9:08:47 a.m. and wheelstop at 9:09:33 a.m. The seven-member STS-131 crew carried the multi-purpose logistics module Leonardo, filled with supplies, a new crew sleeping quarters and science racks that were transferred to the International Space Station's laboratories. The crew also switched out a gyroscope on the station’s truss, installed a spare ammonia storage tank and retrieved a Japanese experiment from the station’s exterior. STS-131 is the 33rd shuttle mission to the station and the 131st shuttle mission overall. For information on the STS-131 mission and crew, visit http:__www.nasa.gov_mission_pages_shuttle_shuttlemissions_sts131_index.html. Photo credit: NASA_Jim Grossmann

CAPE CANAVERAL, Fla. - At the Shuttle Landing Facility at NASA's Kennedy Space Center in Florida, Kuniaki Shiraki, executive director of the Japan Aerospace Exploration Agency, or JAXA, congratulates STS-131 Mission Specialist and JAXA astronaut Naoko Yamazaki on a successful mission following the landing of space shuttle Discovery on Runway 33. Discovery landed at Kennedy after 15 days in space, completing the more than 6.2-million-mile STS-131 mission on orbit 238. Main gear touchdown was at 9:08:35 a.m. EDT followed by nose gear touchdown at 9:08:47 a.m. and wheelstop at 9:09:33 a.m. The seven-member STS-131 crew carried the multi-purpose logistics module Leonardo, filled with supplies, a new crew sleeping quarters and science racks that were transferred to the International Space Station's laboratories. The crew also switched out a gyroscope on the station’s truss, installed a spare ammonia storage tank and retrieved a Japanese experiment from the station’s exterior. STS-131 is the 33rd shuttle mission to the station and the 131st shuttle mission overall. For information on the STS-131 mission and crew, visit http:__www.nasa.gov_mission_pages_shuttle_shuttlemissions_sts131_index.html. Photo credit: NASA_Jim Grossmann

CAPE CANAVERAL, Fla. - At the Shuttle Landing Facility at NASA's Kennedy Space Center in Florida, STS-131 Mission Specialist Rick Mastracchio receives a hug from space shuttle Discovery Flow Director Stephanie Stilson, congratulating him on a successful mission as Mission Specialist Dorothy Metcalf-Lindenburger looks on. Pilot James P. Dutton Jr. is at right. Discovery landed at Kennedy after 15 days in space, completing the more than 6.2-million-mile STS-131 mission on orbit 238. Main gear touchdown was at 9:08:35 a.m. EDT followed by nose gear touchdown at 9:08:47 a.m. and wheelstop at 9:09:33 a.m. The seven-member STS-131 crew carried the multi-purpose logistics module Leonardo, filled with supplies, a new crew sleeping quarters and science racks that were transferred to the International Space Station's laboratories. The crew also switched out a gyroscope on the station’s truss, installed a spare ammonia storage tank and retrieved a Japanese experiment from the station’s exterior. STS-131 is the 33rd shuttle mission to the station and the 131st shuttle mission overall. For information on the STS-131 mission and crew, visit http:__www.nasa.gov_mission_pages_shuttle_shuttlemissions_sts131_index.html. Photo credit: NASA_Jim Grossmann

CAPE CANAVERAL, Fla. - At the Shuttle Landing Facility at NASA's Kennedy Space Center in Florida, STS-131 Pilot James P. Dutton Jr. is congratulated on a successful mission by NASA Flight Director Richard Jones from the Johnson Space Center, at right, as space shuttle Discovery's flow director, Stephanie Stilson, welcomes Mission Specialist Rick Mastracchio back from space. Mission Specialist Dorothy Metcalf-Lindenburger, at left, awaits her turn to talk to Stilson. Discovery landed at Kennedy after 15 days in space, completing the more than 6.2-million-mile STS-131 mission on orbit 238. Main gear touchdown was at 9:08:35 a.m. EDT followed by nose gear touchdown at 9:08:47 a.m. and wheelstop at 9:09:33 a.m. The seven-member STS-131 crew carried the multi-purpose logistics module Leonardo, filled with supplies, a new crew sleeping quarters and science racks that were transferred to the International Space Station's laboratories. The crew also switched out a gyroscope on the station’s truss, installed a spare ammonia storage tank and retrieved a Japanese experiment from the station’s exterior. STS-131 is the 33rd shuttle mission to the station and the 131st shuttle mission overall. For information on the STS-131 mission and crew, visit http:__www.nasa.gov_mission_pages_shuttle_shuttlemissions_sts131_index.html. Photo credit: NASA_Jim Grossmann

CAPE CANAVERAL, Fla. - At the Shuttle Landing Facility at NASA's Kennedy Space Center in Florida, members the STS-131 crew, each holding a flag from his or her country of origin, pose for a group portrait in front of space shuttle Discovery. From left are Mission Specialists Clayton Anderson, Naoko Yamazaki of the Japan Aerospace Exploration Agency, Stephanie Wilson, Dorothy Metcalf-Lindenburger and Rick Mastracchio; Pilot James P. Dutton Jr.; and Commander Alan Poindexter. Discovery landed on Runway 33 after 15 days in space, completing the more than 6.2-million-mile STS-131 mission on orbit 238. Main gear touchdown was at 9:08:35 a.m. EDT followed by nose gear touchdown at 9:08:47 a.m. and wheelstop at 9:09:33 a.m. The seven-member STS-131 crew carried the multi-purpose logistics module Leonardo, filled with supplies, a new crew sleeping quarters and science racks that were transferred to the International Space Station's laboratories. The crew also switched out a gyroscope on the station’s truss, installed a spare ammonia storage tank and retrieved a Japanese experiment from the station’s exterior. STS-131 is the 33rd shuttle mission to the station and the 131st shuttle mission overall. For information on the STS-131 mission and crew, visit http:__www.nasa.gov_mission_pages_shuttle_shuttlemissions_sts131_index.html. Photo credit: NASA_Jim Grossmann

CAPE CANAVERAL, Fla. - At the Shuttle Landing Facility at NASA's Kennedy Space Center in Florida, STS-131 Pilot James P. Dutton Jr., left, and Commander Alan Poindexter proudly pose for the camera under space shuttle Discovery. Discovery landed on Runway 33 after 15 days in space, completing the more than 6.2-million-mile STS-131 mission on orbit 238. Main gear touchdown was at 9:08:35 a.m. EDT followed by nose gear touchdown at 9:08:47 a.m. and wheelstop at 9:09:33 a.m. The seven-member STS-131 crew carried the multi-purpose logistics module Leonardo, filled with supplies, a new crew sleeping quarters and science racks that were transferred to the International Space Station's laboratories. The crew also switched out a gyroscope on the station’s truss, installed a spare ammonia storage tank and retrieved a Japanese experiment from the station’s exterior. STS-131 is the 33rd shuttle mission to the station and the 131st shuttle mission overall. For information on the STS-131 mission and crew, visit http:__www.nasa.gov_mission_pages_shuttle_shuttlemissions_sts131_index.html. Photo credit: NASA_Jim Grossmann

CAPE CANAVERAL, Fla. - On Launch Pad 39A at NASA's Kennedy Space Center in Florida, STS-131 Mission Specialist Naoko Yamazaki of the Japan Aerospace Exploration Agency hops into a slidewire basket during training on the emergency exit system at the pad. The system includes seven baskets suspended from seven slidewires that extend from the fixed service structure to a landing zone 1,200 feet west of the pad. The crew members of space shuttle Discovery's STS-131 mission are at Kennedy for training related to their launch dress rehearsal, the Terminal Countdown Demonstration Test. The seven-member crew will deliver the multi-purpose logistics module Leonardo, filled with resupply stowage platforms and racks, to the International Space Station aboard Discovery. Targeted for launch on April 5, STS-131 will be the 33rd shuttle mission to the station and the 131st shuttle mission overall. For information on the STS-131 mission and crew, visit http:__www.nasa.gov_mission_pages_shuttle_shuttlemissions_sts131_index.html. Photo credit: NASA_Kim Shiflett

CAPE CANAVERAL, Fla. - At Launch Pad 39A at NASA's Kennedy Space Center in Florida, STS-131 crew members practice pad emergency evacuation procedures inside a slidewire basket. Evacuation from the pad's 195-foot level is made possible by seven baskets suspended from seven slidewires that extend from the fixed service structure to a landing zone 1,200 feet west of the pad. The crew members of space shuttle Discovery's STS-131 mission are participating in training related to their launch dress rehearsal, the Terminal Countdown Demonstration Test. The seven-member crew will deliver the multi-purpose logistics module Leonardo, filled with resupply stowage platforms and racks, to the International Space Station aboard Discovery. Targeted for launch on April 5, STS-131 will be the 33rd shuttle mission to the station and the 131st shuttle mission overall. For information on the STS-131 mission and crew, visit http:__www.nasa.gov_mission_pages_shuttle_shuttlemissions_sts131_index.html. Photo credit: NASA_Kim Shiflett

CAPE CANAVERAL, Fla. – STS-131 Mission Specialist Clayton Anderson addresses representatives from the media on hand for his arrival at the Shuttle Landing Facility at NASA’s Kennedy Space Center in Florida. The STS-131 crew members are at Kennedy for the Terminal Countdown Demonstration Test, or TCDT, a dress rehearsal for launch. The seven-member crew will deliver the Multi-Purpose Logistics Module Leonardo, filled with resupply stowage platforms and racks, to the International Space Station aboard space shuttle Discovery. STS-131, targeted for launch on April 5, will be the 33rd shuttle mission to the station and the 131st shuttle mission overall. For information on the STS-131 mission and crew, visit http:__www.nasa.gov_mission_pages_shuttle_shuttlemissions_sts131_index.html. Photo credit: NASA_Kim Shiflett

CAPE CANAVERAL, Fla. - At Launch Pad 39A at NASA's Kennedy Space Center in Florida, STS-131 crew members position themselves inside a slidewire basket as they practice emergency evacuation procedures at the pad. Evacuation from the pad's 195-foot level is made possible by seven baskets suspended from seven slidewires that extend from the fixed service structure to a landing zone 1,200 feet west of the pad. The crew members of space shuttle Discovery's STS-131 mission are participating in training related to their launch dress rehearsal, the Terminal Countdown Demonstration Test. The seven-member crew will deliver the multi-purpose logistics module Leonardo, filled with resupply stowage platforms and racks, to the International Space Station aboard Discovery. Targeted for launch on April 5, STS-131 will be the 33rd shuttle mission to the station and the 131st shuttle mission overall. For information on the STS-131 mission and crew, visit http:__www.nasa.gov_mission_pages_shuttle_shuttlemissions_sts131_index.html. Photo credit: NASA_Kim Shiflett

CAPE CANAVERAL, Fla. - On Launch Pad 39A at NASA's Kennedy Space Center in Florida, STS-131 Mission Specialists Dorothy Metcalf-Lindenburger familiarizes herself with the operation of a slidewire basket during training on the emergency exit system at the pad. The system includes seven baskets suspended from seven slidewires that extend from the fixed service structure to a landing zone 1,200 feet west of the pad. The crew members of space shuttle Discovery's STS-131 mission are at Kennedy for training related to their launch dress rehearsal, the Terminal Countdown Demonstration Test. The seven-member crew will deliver the multi-purpose logistics module Leonardo, filled with resupply stowage platforms and racks, to the International Space Station aboard Discovery. Targeted for launch on April 5, STS-131 will be the 33rd shuttle mission to the station and the 131st shuttle mission overall. For information on the STS-131 mission and crew, visit http:__www.nasa.gov_mission_pages_shuttle_shuttlemissions_sts131_index.html. Photo credit: NASA_Kim Shiflett

CAPE CANAVERAL, Fla. - At Launch Pad 39A at NASA's Kennedy Space Center in Florida, STS-131 Commander Alan Poindexter hops into a slidewire basket during practice for an emergency evacuation of the pad. Evacuation from the pad's 195-foot level is made possible by seven baskets suspended from seven slidewires that extend from the fixed service structure to a landing zone 1,200 feet west of the pad. The crew members of space shuttle Discovery's STS-131 mission are participating in training related to their launch dress rehearsal, the Terminal Countdown Demonstration Test. The seven-member crew will deliver the multi-purpose logistics module Leonardo, filled with resupply stowage platforms and racks, to the International Space Station aboard Discovery. Targeted for launch on April 5, STS-131 will be the 33rd shuttle mission to the station and the 131st shuttle mission overall. For information on the STS-131 mission and crew, visit http:__www.nasa.gov_mission_pages_shuttle_shuttlemissions_sts131_index.html. Photo credit: NASA_Kim Shiflett

CAPE CANAVERAL, Fla. - At NASA's Kennedy Space Center in Florida, space shuttle Discovery arrives at Orbiter Processing Facility-3 following its successful landing on Runway 33 at the Shuttle Landing Facility. Discovery landed at Kennedy after 15 days in space, completing the more than 6.2-million-mile STS-131 mission on orbit 238. Main gear touchdown was at 9:08:35 a.m. EDT followed by nose gear touchdown at 9:08:47 a.m. and wheelstop at 9:09:33 a.m. Aboard were Commander Alan Poindexter; Pilot James P. Dutton Jr.; and Mission Specialists Rick Mastracchio, Clayton Anderson, Dorothy Metcalf-Lindenburger, Stephanie Wilson and Naoko Yamazaki of the Japan Aerospace Exploration Agency. The seven-member STS-131 crew carried the multi-purpose logistics module Leonardo, filled with supplies, a new crew sleeping quarters and science racks that were transferred to the International Space Station's laboratories. The crew also switched out a gyroscope on the station’s truss, installed a spare ammonia storage tank and retrieved a Japanese experiment from the station’s exterior. STS-131 is the 33rd shuttle mission to the station and the 131st shuttle mission overall. For information on the STS-131 mission and crew, visit http:__www.nasa.gov_mission_pages_shuttle_shuttlemissions_sts131_index.html. Photo credit: NASA_Jim Grossmann

CAPE CANAVERAL, Fla. - At NASA's Kennedy Space Center in Florida, space shuttle Discovery begins its slow trek from the Shuttle Landing Facility to Orbiter Processing Facility-3 following its successful landing on Runway 33. Discovery landed at Kennedy after 15 days in space, completing the more than 6.2-million-mile STS-131 mission on orbit 238. Main gear touchdown was at 9:08:35 a.m. EDT followed by nose gear touchdown at 9:08:47 a.m. and wheelstop at 9:09:33 a.m. Aboard were Commander Alan Poindexter; Pilot James P. Dutton Jr.; and Mission Specialists Rick Mastracchio, Clayton Anderson, Dorothy Metcalf-Lindenburger, Stephanie Wilson and Naoko Yamazaki of the Japan Aerospace Exploration Agency. The seven-member STS-131 crew carried the multi-purpose logistics module Leonardo, filled with supplies, a new crew sleeping quarters and science racks that were transferred to the International Space Station's laboratories. The crew also switched out a gyroscope on the station’s truss, installed a spare ammonia storage tank and retrieved a Japanese experiment from the station’s exterior. STS-131 is the 33rd shuttle mission to the station and the 131st shuttle mission overall. For information on the STS-131 mission and crew, visit http:__www.nasa.gov_mission_pages_shuttle_shuttlemissions_sts131_index.html. Photo credit: NASA_Jim Grossmann

CAPE CANAVERAL, Fla. - At NASA's Kennedy Space Center in Florida, a member of the convoy team does his part to 'safe' space shuttle Discovery after its landing on Runway 33 at the Shuttle Landing Facility. Discovery landed at Kennedy after 15 days in space, completing the more than 6.2-million-mile STS-131 mission on orbit 238. Main gear touchdown was at 9:08:35 a.m. EDT followed by nose gear touchdown at 9:08:47 a.m. and wheelstop at 9:09:33 a.m. Aboard are Commander Alan Poindexter; Pilot James P. Dutton Jr.; and Mission Specialists Rick Mastracchio, Clayton Anderson, Dorothy Metcalf-Lindenburger, Stephanie Wilson and Naoko Yamazaki of the Japan Aerospace Exploration Agency. The seven-member STS-131 crew carried the multi-purpose logistics module Leonardo, filled with supplies, a new crew sleeping quarters and science racks that were transferred to the International Space Station's laboratories. The crew also switched out a gyroscope on the station’s truss, installed a spare ammonia storage tank and retrieved a Japanese experiment from the station’s exterior. STS-131 is the 33rd shuttle mission to the station and the 131st shuttle mission overall. For information on the STS-131 mission and crew, visit http:__www.nasa.gov_mission_pages_shuttle_shuttlemissions_sts131_index.html. Photo credit: NASA_Kevin O'Connell

CAPE CANAVERAL, Fla. - At NASA's Kennedy Space Center in Florida, space shuttle Discovery approaches Orbiter Processing Facility-3 following its successful landing on Runway 33 at the Shuttle Landing Facility. Discovery landed at Kennedy after 15 days in space, completing the more than 6.2-million-mile STS-131 mission on orbit 238. Main gear touchdown was at 9:08:35 a.m. EDT followed by nose gear touchdown at 9:08:47 a.m. and wheelstop at 9:09:33 a.m. Aboard were Commander Alan Poindexter; Pilot James P. Dutton Jr.; and Mission Specialists Rick Mastracchio, Clayton Anderson, Dorothy Metcalf-Lindenburger, Stephanie Wilson and Naoko Yamazaki of the Japan Aerospace Exploration Agency. The seven-member STS-131 crew carried the multi-purpose logistics module Leonardo, filled with supplies, a new crew sleeping quarters and science racks that were transferred to the International Space Station's laboratories. The crew also switched out a gyroscope on the station’s truss, installed a spare ammonia storage tank and retrieved a Japanese experiment from the station’s exterior. STS-131 is the 33rd shuttle mission to the station and the 131st shuttle mission overall. For information on the STS-131 mission and crew, visit http:__www.nasa.gov_mission_pages_shuttle_shuttlemissions_sts131_index.html. Photo credit: NASA_Jim Grossmann

CAPE CANAVERAL, Fla. - At NASA's Kennedy Space Center in Florida, space shuttle Discovery is towed into Orbiter Processing Facility-3 following its successful landing on Runway 33 at the Shuttle Landing Facility. Discovery landed at Kennedy after 15 days in space, completing the more than 6.2-million-mile STS-131 mission on orbit 238. Main gear touchdown was at 9:08:35 a.m. EDT followed by nose gear touchdown at 9:08:47 a.m. and wheelstop at 9:09:33 a.m. Aboard were Commander Alan Poindexter; Pilot James P. Dutton Jr.; and Mission Specialists Rick Mastracchio, Clayton Anderson, Dorothy Metcalf-Lindenburger, Stephanie Wilson and Naoko Yamazaki of the Japan Aerospace Exploration Agency. The seven-member STS-131 crew carried the multi-purpose logistics module Leonardo, filled with supplies, a new crew sleeping quarters and science racks that were transferred to the International Space Station's laboratories. The crew also switched out a gyroscope on the station’s truss, installed a spare ammonia storage tank and retrieved a Japanese experiment from the station’s exterior. STS-131 is the 33rd shuttle mission to the station and the 131st shuttle mission overall. For information on the STS-131 mission and crew, visit http:__www.nasa.gov_mission_pages_shuttle_shuttlemissions_sts131_index.html. Photo credit: NASA_Jim Grossmann

CAPE CANAVERAL, Fla. - At NASA's Kennedy Space Center in Florida, space shuttle Discovery makes its slow trek from the Shuttle Landing Facility to Orbiter Processing Facility-3 following its successful landing on Runway 33. Discovery landed at Kennedy after 15 days in space, completing the more than 6.2-million-mile STS-131 mission on orbit 238. Main gear touchdown was at 9:08:35 a.m. EDT followed by nose gear touchdown at 9:08:47 a.m. and wheelstop at 9:09:33 a.m. Aboard were Commander Alan Poindexter; Pilot James P. Dutton Jr.; and Mission Specialists Rick Mastracchio, Clayton Anderson, Dorothy Metcalf-Lindenburger, Stephanie Wilson and Naoko Yamazaki of the Japan Aerospace Exploration Agency. The seven-member STS-131 crew carried the multi-purpose logistics module Leonardo, filled with supplies, a new crew sleeping quarters and science racks that were transferred to the International Space Station's laboratories. The crew also switched out a gyroscope on the station’s truss, installed a spare ammonia storage tank and retrieved a Japanese experiment from the station’s exterior. STS-131 is the 33rd shuttle mission to the station and the 131st shuttle mission overall. For information on the STS-131 mission and crew, visit http:__www.nasa.gov_mission_pages_shuttle_shuttlemissions_sts131_index.html. Photo credit: NASA_Jim Grossmann

CAPE CANAVERAL, Fla. - At NASA's Kennedy Space Center in Florida, space shuttle Discovery makes its slow trek from the Shuttle Landing Facility to Orbiter Processing Facility-3 following its successful landing on Runway 33. Discovery landed at Kennedy after 15 days in space, completing the more than 6.2-million-mile STS-131 mission on orbit 238. Main gear touchdown was at 9:08:35 a.m. EDT followed by nose gear touchdown at 9:08:47 a.m. and wheelstop at 9:09:33 a.m. Aboard were Commander Alan Poindexter; Pilot James P. Dutton Jr.; and Mission Specialists Rick Mastracchio, Clayton Anderson, Dorothy Metcalf-Lindenburger, Stephanie Wilson and Naoko Yamazaki of the Japan Aerospace Exploration Agency. The seven-member STS-131 crew carried the multi-purpose logistics module Leonardo, filled with supplies, a new crew sleeping quarters and science racks that were transferred to the International Space Station's laboratories. The crew also switched out a gyroscope on the station’s truss, installed a spare ammonia storage tank and retrieved a Japanese experiment from the station’s exterior. STS-131 is the 33rd shuttle mission to the station and the 131st shuttle mission overall. For information on the STS-131 mission and crew, visit http:__www.nasa.gov_mission_pages_shuttle_shuttlemissions_sts131_index.html. Photo credit: NASA_Jim Grossmann

CAPE CANAVERAL, Fla. - At NASA's Kennedy Space Center in Florida, work platforms are positioned around space shuttle Discovery in Orbiter Processing Facility-3. Discovery was towed into its hangar following its successful landing on Runway 33 at the Shuttle Landing Facility. Discovery landed at Kennedy after 15 days in space, completing the more than 6.2-million-mile STS-131 mission on orbit 238. Main gear touchdown was at 9:08:35 a.m. EDT followed by nose gear touchdown at 9:08:47 a.m. and wheelstop at 9:09:33 a.m. Aboard were Commander Alan Poindexter; Pilot James P. Dutton Jr.; and Mission Specialists Rick Mastracchio, Clayton Anderson, Dorothy Metcalf-Lindenburger, Stephanie Wilson and Naoko Yamazaki of the Japan Aerospace Exploration Agency. The seven-member STS-131 crew carried the multi-purpose logistics module Leonardo, filled with supplies, a new crew sleeping quarters and science racks that were transferred to the International Space Station's laboratories. The crew also switched out a gyroscope on the station’s truss, installed a spare ammonia storage tank and retrieved a Japanese experiment from the station’s exterior. STS-131 is the 33rd shuttle mission to the station and the 131st shuttle mission overall. For information on the STS-131 mission and crew, visit http:__www.nasa.gov_mission_pages_shuttle_shuttlemissions_sts131_index.html. Photo credit: NASA_Jim Grossmann

CAPE CANAVERAL, Fla. - At the Shuttle Landing Facility at NASA's Kennedy Space Center in Florida, James Cawby, director of Manufacturing and Processing, Launch and Recovery Systems, United Space Alliance, congratulates STS-131 Commander Alan Poindexter on a successful mission following the landing of space shuttle Discovery on Runway 33. On Cawby's right in the receiving line is Mike Orr, director of Launch and Recovery Systems Engineering, United Space Alliance. Pete Nickolenko, NASA's STS-131 launch director is on Cawby's left. The astronauts are, from left, Mission Specialists Naoko Yamazaki of the Japan Aerospace Exploration Agency, Dorothy Metcalf-Lindenburger and Rick Mastracchio; Pilot James P. Dutton Jr.; and Poindexter. Discovery landed at Kennedy after 15 days in space, completing the more than 6.2-million-mile STS-131 mission on orbit 238. Main gear touchdown was at 9:08:35 a.m. EDT followed by nose gear touchdown at 9:08:47 a.m. and wheelstop at 9:09:33 a.m. The seven-member STS-131 crew carried the multi-purpose logistics module Leonardo, filled with supplies, a new crew sleeping quarters and science racks that were transferred to the International Space Station's laboratories. The crew also switched out a gyroscope on the station’s truss, installed a spare ammonia storage tank and retrieved a Japanese experiment from the station’s exterior. STS-131 is the 33rd shuttle mission to the station and the 131st shuttle mission overall. For information on the STS-131 mission and crew, visit http:__www.nasa.gov_mission_pages_shuttle_shuttlemissions_sts131_index.html. Photo credit: NASA_Jim Grossmann

CAPE CANAVERAL, Fla. - At the Shuttle Landing Facility at NASA's Kennedy Space Center in Florida, Larry Ostarly (red tie), director of Ground Systems Support, United Space Alliance, welcomes STS-131 Mission Specialist Rick Mastracchio back from space following the landing of space shuttle Discovery on Runway 33. Also moving down the receiving line, from left, are STS-131 Mission Specialists Naoko Yamazaki of the Japan Aerospace Exploration Agency, Stephanie Wilson, and Dorothy Metcalf-Lindenburger; and Pilot James P. Dutton Jr., at right. Discovery landed at Kennedy after 15 days in space, completing the more than 6.2-million-mile STS-131 mission on orbit 238. Main gear touchdown was at 9:08:35 a.m. EDT followed by nose gear touchdown at 9:08:47 a.m. and wheelstop at 9:09:33 a.m. The seven-member STS-131 crew carried the multi-purpose logistics module Leonardo, filled with supplies, a new crew sleeping quarters and science racks that were transferred to the International Space Station's laboratories. The crew also switched out a gyroscope on the station’s truss, installed a spare ammonia storage tank and retrieved a Japanese experiment from the station’s exterior. STS-131 is the 33rd shuttle mission to the station and the 131st shuttle mission overall. For information on the STS-131 mission and crew, visit http:__www.nasa.gov_mission_pages_shuttle_shuttlemissions_sts131_index.html. Photo credit: NASA_Jim Grossmann

STS131-S-144 (20 April 2010) --- At the Shuttle Landing Facility at NASA's Kennedy Space Center in Florida, members of the STS-131 crew, each holding a flag from his or her country of origin, pose for a portrait in front of space shuttle Discovery. From the right are NASA astronauts Alan Poindexter, commander; James P. Dutton Jr., pilot; Rick Mastracchio, Dorothy Metcalf-Lindenburger, Stephanie Wilson, Japanese astronaut Naoko Yamazaki and NASA astronaut Clayton Anderson, all mission specialists. Discovery landed on Runway 33 after 15 days in space, completing the more than 6.2-million-mile STS-131 mission on orbit 238. Main gear touchdown was at 9:08:35 a.m. (EDT) on April 20, 2010, followed by nose gear touchdown at 9:08:47 a.m. and wheelstop at 9:09:33 a.m. The seven-member STS-131 crew carried the Leonardo Multi-Purpose Logistics Module, filled with supplies, a new crew sleeping quarters and science racks that were transferred to the International Space Station's laboratories. The crew also switched out a gyroscope on the station?s truss, installed a spare ammonia storage tank and retrieved a Japanese experiment from the station?s exterior. STS-131 is the 33rd shuttle mission to the station and the 131st shuttle mission overall.

CAPE CANAVERAL, Fla. - Space shuttle Discovery appears to hover above the ground as it prepares to land on Runway 33 at the Shuttle Landing Facility at NASA's Kennedy Space Center in Florida at 9:08 a.m. EDT, completing the 15-day STS-131 mission to the International Space Station. Main gear touchdown was at 9:08:35 a.m. EDT followed by nose gear touchdown at 9:08:47 a.m. and wheelstop at 9:09:33 a.m. Aboard are Commander Alan Poindexter; Pilot James P. Dutton Jr.; and Mission Specialists Rick Mastracchio, Clayton Anderson, Dorothy Metcalf-Lindenburger, Stephanie Wilson and Naoko Yamazaki of the Japan Aerospace Exploration Agency. The seven-member STS-131 crew carried the multi-purpose logistics module Leonardo, filled with supplies, a new crew sleeping quarters and science racks that were transferred to the International Space Station's laboratories. The crew also switched out a gyroscope on the station’s truss, installed a spare ammonia storage tank and retrieved a Japanese experiment from the station’s exterior. STS-131 is the 33rd shuttle mission to the station and the 131st shuttle mission overall. For information on the STS-131 mission and crew, visit http:__www.nasa.gov_mission_pages_shuttle_shuttlemissions_sts131_index.html. Photo Credit: NASA_Thomas Farrar, Jr.

CAPE CANAVERAL, Fla. - With drag chute unfurled, space shuttle Discovery rolls past a fire rescue vehicle on Runway 33 as it lands at the Shuttle Landing Facility at NASA's Kennedy Space Center in Florida after 15 days in space, completing the more than 6.2-million-mile STS-131 mission on orbit 238. Main gear touchdown was at 9:08:35 a.m. EDT followed by nose gear touchdown at 9:08:47 a.m. and wheelstop at 9:09:33 a.m. Aboard are Commander Alan Poindexter; Pilot James P. Dutton Jr.; and Mission Specialists Rick Mastracchio, Clayton Anderson, Dorothy Metcalf-Lindenburger, Stephanie Wilson and Naoko Yamazaki of the Japan Aerospace Exploration Agency. The seven-member STS-131 crew carried the multi-purpose logistics module Leonardo, filled with supplies, a new crew sleeping quarters and science racks that were transferred to the International Space Station's laboratories. The crew also switched out a gyroscope on the station’s truss, installed a spare ammonia storage tank and retrieved a Japanese experiment from the station’s exterior. STS-131 is the 33rd shuttle mission to the station and the 131st shuttle mission overall. For information on the STS-131 mission and crew, visit http:__www.nasa.gov_mission_pages_shuttle_shuttlemissions_sts131_index.html. Photo credit: NASA_Tony Gray and Tom Farrar

CAPE CANAVERAL, Fla. - Space shuttle Discovery lands on Runway 33 at the Shuttle Landing Facility at NASA's Kennedy Space Center in Florida at 9:08 a.m. EDT, completing the 15-day STS-131 mission to the International Space Station. Main gear touchdown was at 9:08:35 a.m. EDT followed by nose gear touchdown at 9:08:47 a.m. and wheelstop at 9:09:33 a.m. Aboard are Commander Alan Poindexter; Pilot James P. Dutton Jr.; and Mission Specialists Rick Mastracchio, Clayton Anderson, Dorothy Metcalf-Lindenburger, Stephanie Wilson and Naoko Yamazaki of the Japan Aerospace Exploration Agency. The seven-member STS-131 crew carried the multi-purpose logistics module Leonardo, filled with supplies, a new crew sleeping quarters and science racks that were transferred to the International Space Station's laboratories. The crew also switched out a gyroscope on the station’s truss, installed a spare ammonia storage tank and retrieved a Japanese experiment from the station’s exterior. STS-131 is the 33rd shuttle mission to the station and the 131st shuttle mission overall. For information on the STS-131 mission and crew, visit http:__www.nasa.gov_mission_pages_shuttle_shuttlemissions_sts131_index.html. Photo Credit: NASA_Carl Winebarger

CAPE CANAVERAL, Fla. - Space shuttle Discovery lands on Runway 33 at the Shuttle Landing Facility at NASA's Kennedy Space Center in Florida at 9:08 a.m. EDT, completing the 15-day STS-131 mission to the International Space Station. Main gear touchdown was at 9:08:35 a.m. EDT followed by nose gear touchdown at 9:08:47 a.m. and wheelstop at 9:09:33 a.m. Aboard are Commander Alan Poindexter; Pilot James P. Dutton Jr.; and Mission Specialists Rick Mastracchio, Clayton Anderson, Dorothy Metcalf-Lindenburger, Stephanie Wilson and Naoko Yamazaki of the Japan Aerospace Exploration Agency. The seven-member STS-131 crew carried the multi-purpose logistics module Leonardo, filled with supplies, a new crew sleeping quarters and science racks that were transferred to the International Space Station's laboratories. The crew also switched out a gyroscope on the station’s truss, installed a spare ammonia storage tank and retrieved a Japanese experiment from the station’s exterior. STS-131 is the 33rd shuttle mission to the station and the 131st shuttle mission overall. For information on the STS-131 mission and crew, visit http:__www.nasa.gov_mission_pages_shuttle_shuttlemissions_sts131_index.html. Photo Credit: NASA_Rusty Backer

CAPE CANAVERAL, Fla. - Space shuttle Discovery nears touchdown on Runway 33 at the Shuttle Landing Facility at NASA's Kennedy Space Center in Florida. Landing was at 9:08 a.m. EDT, completing the 15-day STS-131 mission to the International Space Station. Main gear touchdown was at 9:08:35 a.m. EDT followed by nose gear touchdown at 9:08:47 a.m. and wheelstop at 9:09:33 a.m. Aboard are Commander Alan Poindexter; Pilot James P. Dutton Jr.; and Mission Specialists Rick Mastracchio, Clayton Anderson, Dorothy Metcalf-Lindenburger, Stephanie Wilson and Naoko Yamazaki of the Japan Aerospace Exploration Agency. The seven-member STS-131 crew carried the multi-purpose logistics module Leonardo, filled with supplies, a new crew sleeping quarters and science racks that were transferred to the International Space Station's laboratories. The crew also switched out a gyroscope on the station’s truss, installed a spare ammonia storage tank and retrieved a Japanese experiment from the station’s exterior. STS-131 is the 33rd shuttle mission to the station and the 131st shuttle mission overall. For information on the STS-131 mission and crew, visit http:__www.nasa.gov_mission_pages_shuttle_shuttlemissions_sts131_index.html. Photo credit: NASA_Chuck Tintera

STS131-S-145 (20 April 2010) --- At the Shuttle Landing Facility at NASA's Kennedy Space Center in Florida, NASA astronauts Alan Poindexter (right) and James P. Dutton Jr., STS-131 commander and pilot, respectively, pose for a photo under space shuttle Discovery. Discovery landed on Runway 33 after 15 days in space, completing the more than 6.2-million-mile STS-131 mission on orbit 238. Main gear touchdown was at 9:08:35 a.m. (EDT) on April 20, 2010, followed by nose gear touchdown at 9:08:47 a.m. and wheelstop at 9:09:33 a.m. The seven-member STS-131 crew carried the Leonardo Multi-Purpose Logistics Module, filled with supplies, a new crew sleeping quarters and science racks that were transferred to the International Space Station's laboratories. The crew also switched out a gyroscope on the station?s truss, installed a spare ammonia storage tank and retrieved a Japanese experiment from the station?s exterior. STS-131 is the 33rd shuttle mission to the station and the 131st shuttle mission overall.

CAPE CANAVERAL, Fla. - Space shuttle Discovery lands on Runway 33 at the Shuttle Landing Facility at NASA's Kennedy Space Center in Florida at 9:08 a.m. EDT, completing the 15-day STS-131 mission to the International Space Station. Main gear touchdown was at 9:08:35 a.m. EDT followed by nose gear touchdown at 9:08:47 a.m. and wheelstop at 9:09:33 a.m. Aboard are Commander Alan Poindexter; Pilot James P. Dutton Jr.; and Mission Specialists Rick Mastracchio, Clayton Anderson, Dorothy Metcalf-Lindenburger, Stephanie Wilson and Naoko Yamazaki of the Japan Aerospace Exploration Agency. The seven-member STS-131 crew carried the multi-purpose logistics module Leonardo, filled with supplies, a new crew sleeping quarters and science racks that were transferred to the International Space Station's laboratories. The crew also switched out a gyroscope on the station’s truss, installed a spare ammonia storage tank and retrieved a Japanese experiment from the station’s exterior. STS-131 is the 33rd shuttle mission to the station and the 131st shuttle mission overall. For information on the STS-131 mission and crew, visit http:__www.nasa.gov_mission_pages_shuttle_shuttlemissions_sts131_index.html. Photo credit: NASA_Chuck Tintera

CAPE CANAVERAL, Fla. - With drag chute unfurled, space shuttle Discovery lands on Runway 33 at the Shuttle Landing Facility at NASA's Kennedy Space Center in Florida after 15 days in space, completing the more than 6.2-million-mile STS-131 mission on orbit 238. Main gear touchdown was at 9:08:35 a.m. EDT followed by nose gear touchdown at 9:08:47 a.m. and wheelstop at 9:09:33 a.m. Aboard are Commander Alan Poindexter; Pilot James P. Dutton Jr.; and Mission Specialists Rick Mastracchio, Clayton Anderson, Dorothy Metcalf-Lindenburger, Stephanie Wilson and Naoko Yamazaki of the Japan Aerospace Exploration Agency. The seven-member STS-131 crew carried the multi-purpose logistics module Leonardo, filled with supplies, a new crew sleeping quarters and science racks that were transferred to the International Space Station's laboratories. The crew also switched out a gyroscope on the station’s truss, installed a spare ammonia storage tank and retrieved a Japanese experiment from the station’s exterior. STS-131 is the 33rd shuttle mission to the station and the 131st shuttle mission overall. For information on the STS-131 mission and crew, visit http:__www.nasa.gov_mission_pages_shuttle_shuttlemissions_sts131_index.html. Photo Credit: NASA_Tony Gray

CAPE CANAVERAL, Fla. - With drag chute unfurled, space shuttle Discovery lands on Runway 33 at the Shuttle Landing Facility at NASA's Kennedy Space Center in Florida after 15 days in space, completing the more than 6.2-million-mile STS-131 mission on orbit 238. Main gear touchdown was at 9:08:35 a.m. EDT followed by nose gear touchdown at 9:08:47 a.m. and wheelstop at 9:09:33 a.m. Aboard are Commander Alan Poindexter; Pilot James P. Dutton Jr.; and Mission Specialists Rick Mastracchio, Clayton Anderson, Dorothy Metcalf-Lindenburger, Stephanie Wilson and Naoko Yamazaki of the Japan Aerospace Exploration Agency. The seven-member STS-131 crew carried the multi-purpose logistics module Leonardo, filled with supplies, a new crew sleeping quarters and science racks that were transferred to the International Space Station's laboratories. The crew also switched out a gyroscope on the station’s truss, installed a spare ammonia storage tank and retrieved a Japanese experiment from the station’s exterior. STS-131 is the 33rd shuttle mission to the station and the 131st shuttle mission overall. For information on the STS-131 mission and crew, visit http:__www.nasa.gov_mission_pages_shuttle_shuttlemissions_sts131_index.html. Photo Credit: NASA_Jack Pfaller

CAPE CANAVERAL, Fla. - Space shuttle Discovery lands on Runway 33 at the Shuttle Landing Facility at NASA's Kennedy Space Center in Florida at 9:08 a.m. EDT, completing the 15-day STS-131 mission to the International Space Station. Main gear touchdown was at 9:08:35 a.m. EDT followed by nose gear touchdown at 9:08:47 a.m. and wheelstop at 9:09:33 a.m. Aboard are Commander Alan Poindexter; Pilot James P. Dutton Jr.; and Mission Specialists Rick Mastracchio, Clayton Anderson, Dorothy Metcalf-Lindenburger, Stephanie Wilson and Naoko Yamazaki of the Japan Aerospace Exploration Agency. The seven-member STS-131 crew carried the multi-purpose logistics module Leonardo, filled with supplies, a new crew sleeping quarters and science racks that were transferred to the International Space Station's laboratories. The crew also switched out a gyroscope on the station’s truss, installed a spare ammonia storage tank and retrieved a Japanese experiment from the station’s exterior. STS-131 is the 33rd shuttle mission to the station and the 131st shuttle mission overall. For information on the STS-131 mission and crew, visit http:__www.nasa.gov_mission_pages_shuttle_shuttlemissions_sts131_index.html. Photo Credit: NASA_Thomas Farrar, Jr.

CAPE CANAVERAL, Fla. - Astronaut Chris Ferguson monitors weather conditions aboard a Shuttle Training Aircraft, or STA, at Kennedy Space Center’s Shuttle Landing Facility in Florida leading up to space shuttle Discovery’s landing on Runway 33 at 9:08 a.m. EDT. Discovery completed the 15-day STS-131 mission to the International Space Station. Main gear touchdown was at 9:08:35 a.m. EDT followed by nose gear touchdown at 9:08:47 a.m. and wheelstop at 9:09:33 a.m. Aboard are Commander Alan Poindexter; Pilot James P. Dutton Jr.; and Mission Specialists Rick Mastracchio, Clayton Anderson, Dorothy Metcalf-Lindenburger, Stephanie Wilson and Naoko Yamazaki of the Japan Aerospace Exploration Agency. The seven-member STS-131 crew carried the multi-purpose logistics module Leonardo, filled with supplies, a new crew sleeping quarters and science racks that were transferred to the International Space Station's laboratories. The crew also switched out a gyroscope on the station’s truss, installed a spare ammonia storage tank and retrieved a Japanese experiment from the station’s exterior. STS-131 is the 33rd shuttle mission to the station and the 131st shuttle mission overall. For information on the STS-131 mission and crew, visit http:__www.nasa.gov_mission_pages_shuttle_shuttlemissions_sts131_index.html. Photo Credit: NASA_Jack Pfaller

CAPE CANAVERAL, Fla. - Space shuttle Discovery lands on Runway 33 at the Shuttle Landing Facility at NASA's Kennedy Space Center in Florida at 9:08 a.m. EDT, completing the 15-day STS-131 mission to the International Space Station. Main gear touchdown was at 9:08:35 a.m. EDT followed by nose gear touchdown at 9:08:47 a.m. and wheelstop at 9:09:33 a.m. Aboard are Commander Alan Poindexter; Pilot James P. Dutton Jr.; and Mission Specialists Rick Mastracchio, Clayton Anderson, Dorothy Metcalf-Lindenburger, Stephanie Wilson and Naoko Yamazaki of the Japan Aerospace Exploration Agency. The seven-member STS-131 crew carried the multi-purpose logistics module Leonardo, filled with supplies, a new crew sleeping quarters and science racks that were transferred to the International Space Station's laboratories. The crew also switched out a gyroscope on the station’s truss, installed a spare ammonia storage tank and retrieved a Japanese experiment from the station’s exterior. STS-131 is the 33rd shuttle mission to the station and the 131st shuttle mission overall. For information on the STS-131 mission and crew, visit http:__www.nasa.gov_mission_pages_shuttle_shuttlemissions_sts131_index.html. Photo Credit: NASA_Carl Winebarger

CAPE CANAVERAL, Fla. - Space shuttle Discovery lands on Runway 33 at the Shuttle Landing Facility at NASA's Kennedy Space Center in Florida at 9:08 a.m. EDT, completing the 15-day STS-131 mission to the International Space Station. Main gear touchdown was at 9:08:35 a.m. EDT followed by nose gear touchdown at 9:08:47 a.m. and wheelstop at 9:09:33 a.m. Aboard are Commander Alan Poindexter; Pilot James P. Dutton Jr.; and Mission Specialists Rick Mastracchio, Clayton Anderson, Dorothy Metcalf-Lindenburger, Stephanie Wilson and Naoko Yamazaki of the Japan Aerospace Exploration Agency. The seven-member STS-131 crew carried the multi-purpose logistics module Leonardo, filled with supplies, a new crew sleeping quarters and science racks that were transferred to the International Space Station's laboratories. The crew also switched out a gyroscope on the station’s truss, installed a spare ammonia storage tank and retrieved a Japanese experiment from the station’s exterior. STS-131 is the 33rd shuttle mission to the station and the 131st shuttle mission overall. For information on the STS-131 mission and crew, visit http:__www.nasa.gov_mission_pages_shuttle_shuttlemissions_sts131_index.html. Photo Credit: NASA_Tim Powers

CAPE CANAVERAL, Fla. - Space shuttle Discovery lands on Runway 33 at the Shuttle Landing Facility at NASA's Kennedy Space Center in Florida at 9:08 a.m. EDT, completing the 15-day STS-131 mission to the International Space Station. The air traffic control tower can be seen in the background. Main gear touchdown was at 9:08:35 a.m. EDT followed by nose gear touchdown at 9:08:47 a.m. and wheelstop at 9:09:33 a.m. Aboard are Commander Alan Poindexter; Pilot James P. Dutton Jr.; and Mission Specialists Rick Mastracchio, Clayton Anderson, Dorothy Metcalf-Lindenburger, Stephanie Wilson and Naoko Yamazaki of the Japan Aerospace Exploration Agency. The seven-member STS-131 crew carried the multi-purpose logistics module Leonardo, filled with supplies, a new crew sleeping quarters and science racks that were transferred to the International Space Station's laboratories. The crew also switched out a gyroscope on the station’s truss, installed a spare ammonia storage tank and retrieved a Japanese experiment from the station’s exterior. STS-131 is the 33rd shuttle mission to the station and the 131st shuttle mission overall. For information on the STS-131 mission and crew, visit http:__www.nasa.gov_mission_pages_shuttle_shuttlemissions_sts131_index.html. Photo Credit: NASA_Rusty Backer

CAPE CANAVERAL, Fla. - Space shuttle Discovery lands on Runway 33 at the Shuttle Landing Facility at NASA's Kennedy Space Center in Florida at 9:08 a.m. EDT, completing the 15-day STS-131 mission to the International Space Station. Main gear touchdown was at 9:08:35 a.m. EDT followed by nose gear touchdown at 9:08:47 a.m. and wheelstop at 9:09:33 a.m. Aboard are Commander Alan Poindexter; Pilot James P. Dutton Jr.; and Mission Specialists Rick Mastracchio, Clayton Anderson, Dorothy Metcalf-Lindenburger, Stephanie Wilson and Naoko Yamazaki of the Japan Aerospace Exploration Agency. The seven-member STS-131 crew carried the multi-purpose logistics module Leonardo, filled with supplies, a new crew sleeping quarters and science racks that were transferred to the International Space Station's laboratories. The crew also switched out a gyroscope on the station’s truss, installed a spare ammonia storage tank and retrieved a Japanese experiment from the station’s exterior. STS-131 is the 33rd shuttle mission to the station and the 131st shuttle mission overall. For information on the STS-131 mission and crew, visit http:__www.nasa.gov_mission_pages_shuttle_shuttlemissions_sts131_index.html. Photo Credit: NASA_Tony Gray

CAPE CANAVERAL, Fla. - Space shuttle Discovery's 40-foot-diameter drag chute unfurls to slow the shuttle as it lands on Runway 33 at the Shuttle Landing Facility at NASA's Kennedy Space Center in Florida after 15 days in space, completing the more than 6.2-million-mile STS-131 mission on orbit 238. Main gear touchdown was at 9:08:35 a.m. EDT followed by nose gear touchdown at 9:08:47 a.m. and wheelstop at 9:09:33 a.m. Aboard are Commander Alan Poindexter; Pilot James P. Dutton Jr.; and Mission Specialists Rick Mastracchio, Clayton Anderson, Dorothy Metcalf-Lindenburger, Stephanie Wilson and Naoko Yamazaki of the Japan Aerospace Exploration Agency. The seven-member STS-131 crew carried the multi-purpose logistics module Leonardo, filled with supplies, a new crew sleeping quarters and science racks that were transferred to the International Space Station's laboratories. The crew also switched out a gyroscope on the station’s truss, installed a spare ammonia storage tank and retrieved a Japanese experiment from the station’s exterior. STS-131 is the 33rd shuttle mission to the station and the 131st shuttle mission overall. For information on the STS-131 mission and crew, visit http:__www.nasa.gov_mission_pages_shuttle_shuttlemissions_sts131_index.html. Photo credit: NASA_Kevin O'Connell

CAPE CANAVERAL, Fla. - Space shuttle Discovery is moments away from touchdown on Runway 33 at the Shuttle Landing Facility at NASA's Kennedy Space Center in Florida. Landing was at 9:08 a.m. EDT, completing the 15-day STS-131 mission to the International Space Station. Main gear touchdown was at 9:08:35 a.m. EDT followed by nose gear touchdown at 9:08:47 a.m. and wheelstop at 9:09:33 a.m. Aboard are Commander Alan Poindexter; Pilot James P. Dutton Jr.; and Mission Specialists Rick Mastracchio, Clayton Anderson, Dorothy Metcalf-Lindenburger, Stephanie Wilson and Naoko Yamazaki of the Japan Aerospace Exploration Agency. The seven-member STS-131 crew carried the multi-purpose logistics module Leonardo, filled with supplies, a new crew sleeping quarters and science racks that were transferred to the International Space Station's laboratories. The crew also switched out a gyroscope on the station’s truss, installed a spare ammonia storage tank and retrieved a Japanese experiment from the station’s exterior. STS-131 is the 33rd shuttle mission to the station and the 131st shuttle mission overall. For information on the STS-131 mission and crew, visit http:__www.nasa.gov_mission_pages_shuttle_shuttlemissions_sts131_index.html. Photo credit: NASA_Tony Gray and Tom Farrar

CAPE CANAVERAL, Fla. - Space shuttle Discovery lands on Runway 33 at the Shuttle Landing Facility at NASA's Kennedy Space Center in Florida at 9:08 a.m. EDT, completing the 15-day STS-131 mission to the International Space Station. Main gear touchdown was at 9:08:35 a.m. EDT followed by nose gear touchdown at 9:08:47 a.m. and wheelstop at 9:09:33 a.m. Aboard are Commander Alan Poindexter; Pilot James P. Dutton Jr.; and Mission Specialists Rick Mastracchio, Clayton Anderson, Dorothy Metcalf-Lindenburger, Stephanie Wilson and Naoko Yamazaki of the Japan Aerospace Exploration Agency. The seven-member STS-131 crew carried the multi-purpose logistics module Leonardo, filled with supplies, a new crew sleeping quarters and science racks that were transferred to the International Space Station's laboratories. The crew also switched out a gyroscope on the station’s truss, installed a spare ammonia storage tank and retrieved a Japanese experiment from the station’s exterior. STS-131 is the 33rd shuttle mission to the station and the 131st shuttle mission overall. For information on the STS-131 mission and crew, visit http:__www.nasa.gov_mission_pages_shuttle_shuttlemissions_sts131_index.html. Photo Credit: NASA_Rusty Backer

CAPE CANAVERAL, Fla. - Space shuttle Discovery lands on Runway 33 at the Shuttle Landing Facility at NASA's Kennedy Space Center in Florida at 9:08 a.m. EDT, completing the 15-day STS-131 mission to the International Space Station. Main gear touchdown was at 9:08:35 a.m. EDT followed by nose gear touchdown at 9:08:47 a.m. and wheelstop at 9:09:33 a.m. Aboard are Commander Alan Poindexter; Pilot James P. Dutton Jr.; and Mission Specialists Rick Mastracchio, Clayton Anderson, Dorothy Metcalf-Lindenburger, Stephanie Wilson and Naoko Yamazaki of the Japan Aerospace Exploration Agency. The seven-member STS-131 crew carried the multi-purpose logistics module Leonardo, filled with supplies, a new crew sleeping quarters and science racks that were transferred to the International Space Station's laboratories. The crew also switched out a gyroscope on the station’s truss, installed a spare ammonia storage tank and retrieved a Japanese experiment from the station’s exterior. STS-131 is the 33rd shuttle mission to the station and the 131st shuttle mission overall. For information on the STS-131 mission and crew, visit http:__www.nasa.gov_mission_pages_shuttle_shuttlemissions_sts131_index.html. Photo credit: NASA_Sandra Joseph and Kevin O'Connell

CAPE CANAVERAL, Fla. - Space shuttle Discovery lands on Runway 33 at the Shuttle Landing Facility at NASA's Kennedy Space Center in Florida at 9:08 a.m. EDT, completing the 15-day STS-131 mission to the International Space Station. Main gear touchdown was at 9:08:35 a.m. EDT followed by nose gear touchdown at 9:08:47 a.m. and wheelstop at 9:09:33 a.m. Aboard are Commander Alan Poindexter; Pilot James P. Dutton Jr.; and Mission Specialists Rick Mastracchio, Clayton Anderson, Dorothy Metcalf-Lindenburger, Stephanie Wilson and Naoko Yamazaki of the Japan Aerospace Exploration Agency. The seven-member STS-131 crew carried the multi-purpose logistics module Leonardo, filled with supplies, a new crew sleeping quarters and science racks that were transferred to the International Space Station's laboratories. The crew also switched out a gyroscope on the station’s truss, installed a spare ammonia storage tank and retrieved a Japanese experiment from the station’s exterior. STS-131 is the 33rd shuttle mission to the station and the 131st shuttle mission overall. For information on the STS-131 mission and crew, visit http:__www.nasa.gov_mission_pages_shuttle_shuttlemissions_sts131_index.html. Photo Credit: NASA_Jim Grossmann

CAPE CANAVERAL, Fla. - Space shuttle Discovery lands on Runway 33 at the Shuttle Landing Facility at NASA's Kennedy Space Center in Florida at 9:08 a.m. EDT, completing the 15-day STS-131 mission to the International Space Station. Main gear touchdown was at 9:08:35 a.m. EDT followed by nose gear touchdown at 9:08:47 a.m. and wheelstop at 9:09:33 a.m. Aboard are Commander Alan Poindexter; Pilot James P. Dutton Jr.; and Mission Specialists Rick Mastracchio, Clayton Anderson, Dorothy Metcalf-Lindenburger, Stephanie Wilson and Naoko Yamazaki of the Japan Aerospace Exploration Agency. The seven-member STS-131 crew carried the multi-purpose logistics module Leonardo, filled with supplies, a new crew sleeping quarters and science racks that were transferred to the International Space Station's laboratories. The crew also switched out a gyroscope on the station’s truss, installed a spare ammonia storage tank and retrieved a Japanese experiment from the station’s exterior. STS-131 is the 33rd shuttle mission to the station and the 131st shuttle mission overall. For information on the STS-131 mission and crew, visit http:__www.nasa.gov_mission_pages_shuttle_shuttlemissions_sts131_index.html. Photo Credit: NASA_Thomas Farrar, Jr.

CAPE CANAVERAL, Fla. - Space shuttle Discovery lands on Runway 33 at the Shuttle Landing Facility at NASA's Kennedy Space Center in Florida at 9:08 a.m. EDT, completing the 15-day STS-131 mission to the International Space Station. Main gear touchdown was at 9:08:35 a.m. EDT followed by nose gear touchdown at 9:08:47 a.m. and wheelstop at 9:09:33 a.m. Aboard are Commander Alan Poindexter; Pilot James P. Dutton Jr.; and Mission Specialists Rick Mastracchio, Clayton Anderson, Dorothy Metcalf-Lindenburger, Stephanie Wilson and Naoko Yamazaki of the Japan Aerospace Exploration Agency. The seven-member STS-131 crew carried the multi-purpose logistics module Leonardo, filled with supplies, a new crew sleeping quarters and science racks that were transferred to the International Space Station's laboratories. The crew also switched out a gyroscope on the station’s truss, installed a spare ammonia storage tank and retrieved a Japanese experiment from the station’s exterior. STS-131 is the 33rd shuttle mission to the station and the 131st shuttle mission overall. For information on the STS-131 mission and crew, visit http:__www.nasa.gov_mission_pages_shuttle_shuttlemissions_sts131_index.html. Photo Credit: NASA_Jack Pfaller

CAPE CANAVERAL, Fla. - With drag chute unfurled, space shuttle Discovery lands on Runway 33 at the Shuttle Landing Facility at NASA's Kennedy Space Center in Florida after 15 days in space, completing the more than 6.2-million-mile STS-131 mission on orbit 238. Main gear touchdown was at 9:08:35 a.m. EDT followed by nose gear touchdown at 9:08:47 a.m. and wheelstop at 9:09:33 a.m. Aboard are Commander Alan Poindexter; Pilot James P. Dutton Jr.; and Mission Specialists Rick Mastracchio, Clayton Anderson, Dorothy Metcalf-Lindenburger, Stephanie Wilson and Naoko Yamazaki of the Japan Aerospace Exploration Agency. The seven-member STS-131 crew carried the multi-purpose logistics module Leonardo, filled with supplies, a new crew sleeping quarters and science racks that were transferred to the International Space Station's laboratories. The crew also switched out a gyroscope on the station’s truss, installed a spare ammonia storage tank and retrieved a Japanese experiment from the station’s exterior. STS-131 is the 33rd shuttle mission to the station and the 131st shuttle mission overall. For information on the STS-131 mission and crew, visit http:__www.nasa.gov_mission_pages_shuttle_shuttlemissions_sts131_index.html. Photo Credit: NASA_Tony Gray

CAPE CANAVERAL, Fla. - With drag chute unfurled, space shuttle Discovery lands on Runway 33 at the Shuttle Landing Facility at NASA's Kennedy Space Center in Florida after 15 days in space, completing the more than 6.2-million-mile STS-131 mission on orbit 238. Main gear touchdown was at 9:08:35 a.m. EDT followed by nose gear touchdown at 9:08:47 a.m. and wheelstop at 9:09:33 a.m. Aboard are Commander Alan Poindexter; Pilot James P. Dutton Jr.; and Mission Specialists Rick Mastracchio, Clayton Anderson, Dorothy Metcalf-Lindenburger, Stephanie Wilson and Naoko Yamazaki of the Japan Aerospace Exploration Agency. The seven-member STS-131 crew carried the multi-purpose logistics module Leonardo, filled with supplies, a new crew sleeping quarters and science racks that were transferred to the International Space Station's laboratories. The crew also switched out a gyroscope on the station’s truss, installed a spare ammonia storage tank and retrieved a Japanese experiment from the station’s exterior. STS-131 is the 33rd shuttle mission to the station and the 131st shuttle mission overall. For information on the STS-131 mission and crew, visit http:__www.nasa.gov_mission_pages_shuttle_shuttlemissions_sts131_index.html. Photo Credit: NASA_Tim Powers

CAPE CANAVERAL, Fla. - Space shuttle Discovery lands on Runway 33 at the Shuttle Landing Facility at NASA's Kennedy Space Center in Florida at 9:08 a.m. EDT, completing the 15-day STS-131 mission to the International Space Station. Main gear touchdown was at 9:08:35 a.m. EDT followed by nose gear touchdown at 9:08:47 a.m. and wheelstop at 9:09:33 a.m. Aboard are Commander Alan Poindexter; Pilot James P. Dutton Jr.; and Mission Specialists Rick Mastracchio, Clayton Anderson, Dorothy Metcalf-Lindenburger, Stephanie Wilson and Naoko Yamazaki of the Japan Aerospace Exploration Agency. The seven-member STS-131 crew carried the multi-purpose logistics module Leonardo, filled with supplies, a new crew sleeping quarters and science racks that were transferred to the International Space Station's laboratories. The crew also switched out a gyroscope on the station’s truss, installed a spare ammonia storage tank and retrieved a Japanese experiment from the station’s exterior. STS-131 is the 33rd shuttle mission to the station and the 131st shuttle mission overall. For information on the STS-131 mission and crew, visit http:__www.nasa.gov_mission_pages_shuttle_shuttlemissions_sts131_index.html. Photo Credit: NASA_Jack Pfaller

CAPE CANAVERAL, Fla. - Space shuttle Discovery lands on Runway 33 at the Shuttle Landing Facility at NASA's Kennedy Space Center in Florida at 9:08 a.m. EDT, completing the 15-day STS-131 mission to the International Space Station. Main gear touchdown was at 9:08:35 a.m. EDT followed by nose gear touchdown at 9:08:47 a.m. and wheelstop at 9:09:33 a.m. Aboard are Commander Alan Poindexter; Pilot James P. Dutton Jr.; and Mission Specialists Rick Mastracchio, Clayton Anderson, Dorothy Metcalf-Lindenburger, Stephanie Wilson and Naoko Yamazaki of the Japan Aerospace Exploration Agency. The seven-member STS-131 crew carried the multi-purpose logistics module Leonardo, filled with supplies, a new crew sleeping quarters and science racks that were transferred to the International Space Station's laboratories. The crew also switched out a gyroscope on the station’s truss, installed a spare ammonia storage tank and retrieved a Japanese experiment from the station’s exterior. STS-131 is the 33rd shuttle mission to the station and the 131st shuttle mission overall. For information on the STS-131 mission and crew, visit http:__www.nasa.gov_mission_pages_shuttle_shuttlemissions_sts131_index.html. Photo credit: NASA_Ben Cooper

CAPE CANAVERAL, Fla. - With drag chute unfurled, space shuttle Discovery lands on Runway 33 at the Shuttle Landing Facility at NASA's Kennedy Space Center in Florida after 15 days in space, completing the more than 6.2-million-mile STS-131 mission on orbit 238. Main gear touchdown was at 9:08:35 a.m. EDT followed by nose gear touchdown at 9:08:47 a.m. and wheelstop at 9:09:33 a.m. Aboard are Commander Alan Poindexter; Pilot James P. Dutton Jr.; and Mission Specialists Rick Mastracchio, Clayton Anderson, Dorothy Metcalf-Lindenburger, Stephanie Wilson and Naoko Yamazaki of the Japan Aerospace Exploration Agency. The seven-member STS-131 crew carried the multi-purpose logistics module Leonardo, filled with supplies, a new crew sleeping quarters and science racks that were transferred to the International Space Station's laboratories. The crew also switched out a gyroscope on the station’s truss, installed a spare ammonia storage tank and retrieved a Japanese experiment from the station’s exterior. STS-131 is the 33rd shuttle mission to the station and the 131st shuttle mission overall. For information on the STS-131 mission and crew, visit http:__www.nasa.gov_mission_pages_shuttle_shuttlemissions_sts131_index.html. Photo Credit: NASA_Tim Powers

CAPE CANAVERAL, Fla. - Space shuttle Discovery is moments away from touchdown on Runway 33 at the Shuttle Landing Facility at NASA's Kennedy Space Center in Florida. Landing was at 9:08 a.m. EDT, completing the 15-day STS-131 mission to the International Space Station. Main gear touchdown was at 9:08:35 a.m. EDT followed by nose gear touchdown at 9:08:47 a.m. and wheelstop at 9:09:33 a.m. Aboard are Commander Alan Poindexter; Pilot James P. Dutton Jr.; and Mission Specialists Rick Mastracchio, Clayton Anderson, Dorothy Metcalf-Lindenburger, Stephanie Wilson and Naoko Yamazaki of the Japan Aerospace Exploration Agency. The seven-member STS-131 crew carried the multi-purpose logistics module Leonardo, filled with supplies, a new crew sleeping quarters and science racks that were transferred to the International Space Station's laboratories. The crew also switched out a gyroscope on the station’s truss, installed a spare ammonia storage tank and retrieved a Japanese experiment from the station’s exterior. STS-131 is the 33rd shuttle mission to the station and the 131st shuttle mission overall. For information on the STS-131 mission and crew, visit http:__www.nasa.gov_mission_pages_shuttle_shuttlemissions_sts131_index.html. Photo credit: NASA_Tony Gray and Tom Farrar

CAPE CANAVERAL, Fla. - Space shuttle Discovery lands on Runway 33 at the Shuttle Landing Facility at NASA's Kennedy Space Center in Florida at 9:08 a.m. EDT, completing the 15-day STS-131 mission to the International Space Station. Main gear touchdown was at 9:08:35 a.m. EDT followed by nose gear touchdown at 9:08:47 a.m. and wheelstop at 9:09:33 a.m. Aboard are Commander Alan Poindexter; Pilot James P. Dutton Jr.; and Mission Specialists Rick Mastracchio, Clayton Anderson, Dorothy Metcalf-Lindenburger, Stephanie Wilson and Naoko Yamazaki of the Japan Aerospace Exploration Agency. The seven-member STS-131 crew carried the multi-purpose logistics module Leonardo, filled with supplies, a new crew sleeping quarters and science racks that were transferred to the International Space Station's laboratories. The crew also switched out a gyroscope on the station’s truss, installed a spare ammonia storage tank and retrieved a Japanese experiment from the station’s exterior. STS-131 is the 33rd shuttle mission to the station and the 131st shuttle mission overall. For information on the STS-131 mission and crew, visit http:__www.nasa.gov_mission_pages_shuttle_shuttlemissions_sts131_index.html. Photo Credit: NASA_Jim Grossmann

CAPE CANAVERAL, Fla. - Space shuttle Discovery nears touchdown on Runway 33 at the Shuttle Landing Facility at NASA's Kennedy Space Center in Florida. Landing was at 9:08 a.m. EDT, completing the 15-day STS-131 mission to the International Space Station. Main gear touchdown was at 9:08:35 a.m. EDT followed by nose gear touchdown at 9:08:47 a.m. and wheelstop at 9:09:33 a.m. Aboard are Commander Alan Poindexter; Pilot James P. Dutton Jr.; and Mission Specialists Rick Mastracchio, Clayton Anderson, Dorothy Metcalf-Lindenburger, Stephanie Wilson and Naoko Yamazaki of the Japan Aerospace Exploration Agency. The seven-member STS-131 crew carried the multi-purpose logistics module Leonardo, filled with supplies, a new crew sleeping quarters and science racks that were transferred to the International Space Station's laboratories. The crew also switched out a gyroscope on the station’s truss, installed a spare ammonia storage tank and retrieved a Japanese experiment from the station’s exterior. STS-131 is the 33rd shuttle mission to the station and the 131st shuttle mission overall. For information on the STS-131 mission and crew, visit http:__www.nasa.gov_mission_pages_shuttle_shuttlemissions_sts131_index.html. Photo credit: NASA_Ben Cooper

CAPE CANAVERAL, Fla. - Space shuttle Discovery lands on Runway 33 at the Shuttle Landing Facility at NASA's Kennedy Space Center in Florida at 9:08 a.m. EDT, completing the 15-day STS-131 mission to the International Space Station. Main gear touchdown was at 9:08:35 a.m. EDT followed by nose gear touchdown at 9:08:47 a.m. and wheelstop at 9:09:33 a.m. Aboard are Commander Alan Poindexter; Pilot James P. Dutton Jr.; and Mission Specialists Rick Mastracchio, Clayton Anderson, Dorothy Metcalf-Lindenburger, Stephanie Wilson and Naoko Yamazaki of the Japan Aerospace Exploration Agency. The seven-member STS-131 crew carried the multi-purpose logistics module Leonardo, filled with supplies, a new crew sleeping quarters and science racks that were transferred to the International Space Station's laboratories. The crew also switched out a gyroscope on the station’s truss, installed a spare ammonia storage tank and retrieved a Japanese experiment from the station’s exterior. STS-131 is the 33rd shuttle mission to the station and the 131st shuttle mission overall. For information on the STS-131 mission and crew, visit http:__www.nasa.gov_mission_pages_shuttle_shuttlemissions_sts131_index.html. Photo Credit: NASA_Rusty Backer

CAPE CANAVERAL, Fla. - Space shuttle Discovery nears touchdown on Runway 33 at the Shuttle Landing Facility at NASA's Kennedy Space Center in Florida. Landing was at 9:08 a.m. EDT, completing the 15-day STS-131 mission to the International Space Station. Main gear touchdown was at 9:08:35 a.m. EDT followed by nose gear touchdown at 9:08:47 a.m. and wheelstop at 9:09:33 a.m. Aboard are Commander Alan Poindexter; Pilot James P. Dutton Jr.; and Mission Specialists Rick Mastracchio, Clayton Anderson, Dorothy Metcalf-Lindenburger, Stephanie Wilson and Naoko Yamazaki of the Japan Aerospace Exploration Agency. The seven-member STS-131 crew carried the multi-purpose logistics module Leonardo, filled with supplies, a new crew sleeping quarters and science racks that were transferred to the International Space Station's laboratories. The crew also switched out a gyroscope on the station’s truss, installed a spare ammonia storage tank and retrieved a Japanese experiment from the station’s exterior. STS-131 is the 33rd shuttle mission to the station and the 131st shuttle mission overall. For information on the STS-131 mission and crew, visit http:__www.nasa.gov_mission_pages_shuttle_shuttlemissions_sts131_index.html. Photo credit: NASA_Tony Gray and Tom Farrar

CAPE CANAVERAL, Fla. - With drag chute unfurled, space shuttle Discovery lands on Runway 33 at the Shuttle Landing Facility at NASA's Kennedy Space Center in Florida after 15 days in space, completing the more than 6.2-million-mile STS-131 mission on orbit 238. Main gear touchdown was at 9:08:35 a.m. EDT followed by nose gear touchdown at 9:08:47 a.m. and wheelstop at 9:09:33 a.m. Aboard are Commander Alan Poindexter; Pilot James P. Dutton Jr.; and Mission Specialists Rick Mastracchio, Clayton Anderson, Dorothy Metcalf-Lindenburger, Stephanie Wilson and Naoko Yamazaki of the Japan Aerospace Exploration Agency. The seven-member STS-131 crew carried the multi-purpose logistics module Leonardo, filled with supplies, a new crew sleeping quarters and science racks that were transferred to the International Space Station's laboratories. The crew also switched out a gyroscope on the station’s truss, installed a spare ammonia storage tank and retrieved a Japanese experiment from the station’s exterior. STS-131 is the 33rd shuttle mission to the station and the 131st shuttle mission overall. For information on the STS-131 mission and crew, visit http:__www.nasa.gov_mission_pages_shuttle_shuttlemissions_sts131_index.html. Photo Credit: NASA_Jack Pfaller

CAPE CANAVERAL, Fla. - Space shuttle Discovery lands on Runway 33 at the Shuttle Landing Facility at NASA's Kennedy Space Center in Florida at 9:08 a.m. EDT, completing the 15-day STS-131 mission to the International Space Station. In the background is the Vehicle Assembly Building, or VAB. Main gear touchdown was at 9:08:35 a.m. EDT followed by nose gear touchdown at 9:08:47 a.m. and wheelstop at 9:09:33 a.m. Aboard are Commander Alan Poindexter; Pilot James P. Dutton Jr.; and Mission Specialists Rick Mastracchio, Clayton Anderson, Dorothy Metcalf-Lindenburger, Stephanie Wilson and Naoko Yamazaki of the Japan Aerospace Exploration Agency. The seven-member STS-131 crew carried the multi-purpose logistics module Leonardo, filled with supplies, a new crew sleeping quarters and science racks that were transferred to the International Space Station's laboratories. The crew also switched out a gyroscope on the station’s truss, installed a spare ammonia storage tank and retrieved a Japanese experiment from the station’s exterior. STS-131 is the 33rd shuttle mission to the station and the 131st shuttle mission overall. For information on the STS-131 mission and crew, visit http:__www.nasa.gov_mission_pages_shuttle_shuttlemissions_sts131_index.html. Photo Credit: NASA_Rusty Backer

CAPE CANAVERAL, Fla. - With drag chute unfurled, space shuttle Discovery lands on Runway 33 at the Shuttle Landing Facility at NASA's Kennedy Space Center in Florida after 15 days in space, completing the more than 6.2-million-mile STS-131 mission on orbit 238. Main gear touchdown was at 9:08:35 a.m. EDT followed by nose gear touchdown at 9:08:47 a.m. and wheelstop at 9:09:33 a.m. Aboard are Commander Alan Poindexter; Pilot James P. Dutton Jr.; and Mission Specialists Rick Mastracchio, Clayton Anderson, Dorothy Metcalf-Lindenburger, Stephanie Wilson and Naoko Yamazaki of the Japan Aerospace Exploration Agency. The seven-member STS-131 crew carried the multi-purpose logistics module Leonardo, filled with supplies, a new crew sleeping quarters and science racks that were transferred to the International Space Station's laboratories. The crew also switched out a gyroscope on the station’s truss, installed a spare ammonia storage tank and retrieved a Japanese experiment from the station’s exterior. STS-131 is the 33rd shuttle mission to the station and the 131st shuttle mission overall. For information on the STS-131 mission and crew, visit http:__www.nasa.gov_mission_pages_shuttle_shuttlemissions_sts131_index.html. Photo credit: NASA_Sandra Joseph and Kevin O'Connell

CAPE CANAVERAL, Fla. - Space shuttle Discovery's 40-foot-diameter drag chute extends with the aid of a mortar-deployed pilot chute. Its purpose is to slow the shuttle as it lands on Runway 33 at the Shuttle Landing Facility at NASA's Kennedy Space Center in Florida after 15 days in space, completing the more than 6.2-million-mile STS-131 mission on orbit 238. Main gear touchdown was at 9:08:35 a.m. EDT followed by nose gear touchdown at 9:08:47 a.m. and wheelstop at 9:09:33 a.m. Aboard are Commander Alan Poindexter; Pilot James P. Dutton Jr.; and Mission Specialists Rick Mastracchio, Clayton Anderson, Dorothy Metcalf-Lindenburger, Stephanie Wilson and Naoko Yamazaki of the Japan Aerospace Exploration Agency. The seven-member STS-131 crew carried the multi-purpose logistics module Leonardo, filled with supplies, a new crew sleeping quarters and science racks that were transferred to the International Space Station's laboratories. The crew also switched out a gyroscope on the station’s truss, installed a spare ammonia storage tank and retrieved a Japanese experiment from the station’s exterior. STS-131 is the 33rd shuttle mission to the station and the 131st shuttle mission overall. For information on the STS-131 mission and crew, visit http:__www.nasa.gov_mission_pages_shuttle_shuttlemissions_sts131_index.html. Photo credit: NASA_Kevin O'Connell

CAPE CANAVERAL, Fla. - Space shuttle Discovery lands on Runway 33 at the Shuttle Landing Facility at NASA's Kennedy Space Center in Florida at 9:08 a.m. EDT, completing the 15-day STS-131 mission to the International Space Station. Main gear touchdown was at 9:08:35 a.m. EDT followed by nose gear touchdown at 9:08:47 a.m. and wheelstop at 9:09:33 a.m. Aboard are Commander Alan Poindexter; Pilot James P. Dutton Jr.; and Mission Specialists Rick Mastracchio, Clayton Anderson, Dorothy Metcalf-Lindenburger, Stephanie Wilson and Naoko Yamazaki of the Japan Aerospace Exploration Agency. The seven-member STS-131 crew carried the multi-purpose logistics module Leonardo, filled with supplies, a new crew sleeping quarters and science racks that were transferred to the International Space Station's laboratories. The crew also switched out a gyroscope on the station’s truss, installed a spare ammonia storage tank and retrieved a Japanese experiment from the station’s exterior. STS-131 is the 33rd shuttle mission to the station and the 131st shuttle mission overall. For information on the STS-131 mission and crew, visit http:__www.nasa.gov_mission_pages_shuttle_shuttlemissions_sts131_index.html. Photo Credit: NASA_Rusty Backer

CAPE CANAVERAL, Fla. - Space shuttle Discovery nears touchdown on Runway 33 at the Shuttle Landing Facility at NASA's Kennedy Space Center in Florida. Landing was at 9:08 a.m. EDT, completing the 15-day STS-131 mission to the International Space Station. Main gear touchdown was at 9:08:35 a.m. EDT followed by nose gear touchdown at 9:08:47 a.m. and wheelstop at 9:09:33 a.m. Aboard are Commander Alan Poindexter; Pilot James P. Dutton Jr.; and Mission Specialists Rick Mastracchio, Clayton Anderson, Dorothy Metcalf-Lindenburger, Stephanie Wilson and Naoko Yamazaki of the Japan Aerospace Exploration Agency. The seven-member STS-131 crew carried the multi-purpose logistics module Leonardo, filled with supplies, a new crew sleeping quarters and science racks that were transferred to the International Space Station's laboratories. The crew also switched out a gyroscope on the station’s truss, installed a spare ammonia storage tank and retrieved a Japanese experiment from the station’s exterior. STS-131 is the 33rd shuttle mission to the station and the 131st shuttle mission overall. For information on the STS-131 mission and crew, visit http:__www.nasa.gov_mission_pages_shuttle_shuttlemissions_sts131_index.html. Photo credit: NASA_Ben Cooper

CAPE CANAVERAL, Fla. - Space shuttle Discovery lands on Runway 33 at the Shuttle Landing Facility at NASA's Kennedy Space Center in Florida at 9:08 a.m. EDT, completing the 15-day STS-131 mission to the International Space Station. Main gear touchdown was at 9:08:35 a.m. EDT followed by nose gear touchdown at 9:08:47 a.m. and wheelstop at 9:09:33 a.m. Aboard are Commander Alan Poindexter; Pilot James P. Dutton Jr.; and Mission Specialists Rick Mastracchio, Clayton Anderson, Dorothy Metcalf-Lindenburger, Stephanie Wilson and Naoko Yamazaki of the Japan Aerospace Exploration Agency. The seven-member STS-131 crew carried the multi-purpose logistics module Leonardo, filled with supplies, a new crew sleeping quarters and science racks that were transferred to the International Space Station's laboratories. The crew also switched out a gyroscope on the station’s truss, installed a spare ammonia storage tank and retrieved a Japanese experiment from the station’s exterior. STS-131 is the 33rd shuttle mission to the station and the 131st shuttle mission overall. For information on the STS-131 mission and crew, visit http:__www.nasa.gov_mission_pages_shuttle_shuttlemissions_sts131_index.html. Photo Credit: NASA_Carl Winebarger

CAPE CANAVERAL, Fla. - Space shuttle Discovery lands on Runway 33 at the Shuttle Landing Facility at NASA's Kennedy Space Center in Florida at 9:08 a.m. EDT, completing the 15-day STS-131 mission to the International Space Station. Main gear touchdown was at 9:08:35 a.m. EDT followed by nose gear touchdown at 9:08:47 a.m. and wheelstop at 9:09:33 a.m. Aboard are Commander Alan Poindexter; Pilot James P. Dutton Jr.; and Mission Specialists Rick Mastracchio, Clayton Anderson, Dorothy Metcalf-Lindenburger, Stephanie Wilson and Naoko Yamazaki of the Japan Aerospace Exploration Agency. The seven-member STS-131 crew carried the multi-purpose logistics module Leonardo, filled with supplies, a new crew sleeping quarters and science racks that were transferred to the International Space Station's laboratories. The crew also switched out a gyroscope on the station’s truss, installed a spare ammonia storage tank and retrieved a Japanese experiment from the station’s exterior. STS-131 is the 33rd shuttle mission to the station and the 131st shuttle mission overall. For information on the STS-131 mission and crew, visit http:__www.nasa.gov_mission_pages_shuttle_shuttlemissions_sts131_index.html. Photo Credit: NASA_Tony Gray

CAPE CANAVERAL, Fla. - Space shuttle Discovery nears touchdown on Runway 33 at the Shuttle Landing Facility at NASA's Kennedy Space Center in Florida. Landing was at 9:08 a.m. EDT, completing the 15-day STS-131 mission to the International Space Station. Main gear touchdown was at 9:08:35 a.m. EDT followed by nose gear touchdown at 9:08:47 a.m. and wheelstop at 9:09:33 a.m. Aboard are Commander Alan Poindexter; Pilot James P. Dutton Jr.; and Mission Specialists Rick Mastracchio, Clayton Anderson, Dorothy Metcalf-Lindenburger, Stephanie Wilson and Naoko Yamazaki of the Japan Aerospace Exploration Agency. The seven-member STS-131 crew carried the multi-purpose logistics module Leonardo, filled with supplies, a new crew sleeping quarters and science racks that were transferred to the International Space Station's laboratories. The crew also switched out a gyroscope on the station’s truss, installed a spare ammonia storage tank and retrieved a Japanese experiment from the station’s exterior. STS-131 is the 33rd shuttle mission to the station and the 131st shuttle mission overall. For information on the STS-131 mission and crew, visit http:__www.nasa.gov_mission_pages_shuttle_shuttlemissions_sts131_index.html. Photo credit: NASA_Tony Gray and Tom Farrar

CAPE CANAVERAL, Fla. - At the Shuttle Landing Facility at NASA's Kennedy Space Center in Florida, at center, space shuttle Discovery Flow Director Stephanie Stilson talks to STS-131 Mission Specialist Naoko Yamazaki of the Japan Aerospace Exploration Agency about her successful mission as NASA Flight Director Richard Jones from the Johnson Space Center looks on. At right, Larry Ostarly (red tie), director of Ground Systems Support, United Space Alliance, welcomes STS-131 Mission Specialist Stephanie Wilson back from space with James Cawby, director of Manufacturing and Processing, Launch and Recovery Systems, United Space Alliance, at right, awaiting his turn. Making his way down the receifing line, at left, is Mission Specialist Clayton Anderson. Discovery landed at Kennedy after 15 days in space, completing the more than 6.2-million-mile STS-131 mission on orbit 238. Main gear touchdown was at 9:08:35 a.m. EDT followed by nose gear touchdown at 9:08:47 a.m. and wheelstop at 9:09:33 a.m. The seven-member STS-131 crew carried the multi-purpose logistics module Leonardo, filled with supplies, a new crew sleeping quarters and science racks that were transferred to the International Space Station's laboratories. The crew also switched out a gyroscope on the station’s truss, installed a spare ammonia storage tank and retrieved a Japanese experiment from the station’s exterior. STS-131 is the 33rd shuttle mission to the station and the 131st shuttle mission overall. For information on the STS-131 mission and crew, visit http:__www.nasa.gov_mission_pages_shuttle_shuttlemissions_sts131_index.html. Photo credit: NASA_Jim Grossmann

CAPE CANAVERAL, Fla. - In Orbiter Processing Facility-3 at NASA's Kennedy Space Center in Florida, the multi-purpose logistics module Leonardo and an ammonia tank assembly, removed from space shuttle Discovery's payload bay, are secured in the payload canister which will transport them to the Space Station Processing Facility. Discovery landed on Runway 33 at Kennedy's Shuttle Landing Facility at 9:08 a.m. EDT April 20 after 15 days in space, completing the more than 6.2-million-mile STS-131 mission on orbit 238. The seven-member STS-131 crew carried the multi-purpose logistics module Leonardo, filled with supplies, a new crew sleeping quarters and science racks that were transferred to the International Space Station's laboratories. Leonardo now will be modified into a permanent multi-purpose module, or PMM, and left aboard the station on space shuttle Discovery's STS-133 mission, targeted for launch Sept. 16. For information on the STS-131 mission, visit http:__www.nasa.gov_mission_pages_shuttle_shuttlemissions_sts131_index.html. For information on the STS-133 mission, visit http:__www.nasa.gov_mission_pages_shuttle_shuttlemissions_sts133_index.html. Photo credit: NASA_Jack Pfaller