Expedition 56 Flight Engineer Ricky Arnold of NASA restss in a helicopter as Russian Nurse Artiom Kharchikov, left, and NASA Flight Surgeon Steven Piper, right look after him near the town of Zhezkazgan, Kazakhstan on Thursday, Oct. 4, 2018. Arnold, Expedition 56 Commander Drew Feustel of NASA and Expedition 56 Flight Engineer and Soyuz Commander Oleg Artemyev of Roscosmos returned to Earth after 197 days in space where they served as members of the Expedition 55 and 56 crews onboard the International Space Station. Photo Credit: (NASA/Bill Ingalls)

JSC2006-E-34241 (11 August 2006) --- The STS-115 crew posed for photos following its August 11 preflight press briefing at the Johnson Space Center. From the left are astronauts Joseph R. Tanner, Heidemarie M. Stefanyshyn-Piper, Brent W. Jett Jr., Christopher J. Ferguson, Steven G. MacLean (Canadian Space Agency) and Daniel C. Burbank.

JSC2005-E-17421 (28 April 2005) --- Crew trainer David Pogue (right) briefs STS-115 crewmembers during an emergency egress training session in the Space Vehicle Mockup Facility at Johnson Space Center. From the left are astronauts Brent W. Jett Jr., commander; Joseph R. (Joe) Tanner and Daniel C. Burbank, both mission specialists; Christopher J. Ferguson, pilot; Heidemarie M. Stefanyshyn-Piper, mission specialist; and Steven G. MacLean, mission specialist representing the Canadian Space Agency.

These six astronauts take a break from training to pose for the STS-115 crew portrait. Astronauts Brent W. Jett, Jr. (right) and Christopher J. Ferguson, commander and pilot, respectively, flank the mission insignia. The mission specialists are, from left to right, astronauts Heidemarie M. Stefanyshyn-Piper, Joseph R. (Joe) Tanner, Daniel C. Burbank, and Steven G. MacLean, who represents the Canadian Space Agency. This mission continued the assembly of the International Space Station (ISS) with the installation of the truss segments P3 and P4.

S115-E-E-05528 (12 Sept. 2006) --- Astronaut Steven G. MacLean, representing the Canadian Space Agency, works at the controls for the Canadarm2 or space station remote manipulator arm as part of the team effort to successfully complete "installation day" on the International Space Station. The Atlantis and Expedition 13 crews worked on attaching the P3/P4 truss during the first of three scheduled spacewalks by STS-115 shuttle crew members. Today's space walkers were astronauts Joseph R. Tanner and Heidemarie M. Stefanyshyn-Piper.

JSC2005-E-13817 (5 April 2005) --- Astronaut Steven G. MacLean, STS-115 mission specialist representing the Canadian Space Agency, attired in a training version of the shuttle launch and entry suit, awaits the start of an emergency egress training session in the Space Vehicle Mockup Facility at the Johnson Space Center. Astronaut Heidemarie M. Stefanyshyn-Piper, mission specialist, is visible in the background.

JOHNSON SPACE CENTER, TX - STS115-S-002 (November 8, 2002) -- These six astronauts take a break from training to pose for the STS-115 crew portrait. Astronauts Brent W. Jett Jr. (right) and Christopher J. Ferguson, command and pilot respectively, flank the mission insignia. The mission specialists are, from left to right, astronauts Heidemarie M. Stefanyshyn-Piper, Joseph R. (Joe) Tanner, Daniel C. Burbank, and Steven G. MacLean, who represents the Canadian Space Agency.

STS115-S-002 (8 November 2002) --- These six astronauts take a break from training to pose for the STS-115 crew portrait. Astronauts Brent W. Jett, Jr. (right) and Christopher J. Ferguson, commander and pilot, respectively, flank the mission insignia. The mission specialists are, from left to right, astronauts Heidemarie M. Stefanyshyn-Piper, Joseph R. (Joe) Tanner, Daniel C. Burbank, and Steven G. MacLean, who represents the Canadian Space Agency.

ISS013-E-81541 (14 Sept. 2006) --- STS-115 crewmembers photographed while working in the Destiny laboratory of the International Space Station while Space Shuttle Atlantis was docked with the station. From the left are astronauts Joseph R. Tanner, Daniel C. Burbank, Heidemarie M. Stefanyshyn-Piper, Steven G. MacLean representing the Canadian Space Agency, all mission specialists; and Brent W. Jett, Jr., commander.

ISS013-E-80781 (12 Sept. 2006) --- Canadian Space Agency astronaut Steven G. MacLean, STS-115 mission specialist, and astronaut Christopher J. Ferguson, pilot, work inside the Destiny laboratory to support the first day of the resumption of construction on the International Space Station. Two crewmates--astronauts Heidemarie M. Stefanyshyn-Piper and Joseph R. Tanner--earlier donned extravehicular mobility units and were outside now participating in the first of three scheduled space walks.

KENNEDY SPACE CENTER, FLA. - The STS-115 crew poses in front of the orbiter Atlantis, which brought them safely back from space to NASA's Kennedy Space Center. From left are Mission Specialists Daniel Burbank, Heidemarie Stefanyshyn-Piper and Steven MacLean; Pilot Christopher Ferguson; Commander Brent Jett; and Mission Specialist Joseph Tanner. During the mission, Tanner, McLean, Burbank and Piper completed three spacewalks to attach the P3/P4 integrated truss structure to the International Space Station. Main gear touchdown was at 6:21:30 a.m. EDT. Nose gear touchdown was at 6:21:36 a.m. and wheel stop was at 6:22:16 a.m. Atlantis traveled 4.9 million miles, landing on orbit 187. Mission elapsed time was 11 days, 19 hours, six minutes. This is the 15th night landing at KSC and the 23rd night landing overall. Photo credit: NASA/Kim Shiflett

KENNEDY SPACE CENTER, FLA. - STS-115 Mission Specialist Steven MacLean takes his turn driving the M-113 armored personnel carrier. STS-115 Mission Specialist Steven MacLean takes his turn driving the M-113 armored personnel carrier. Passengers on the carrier are Mission Specialists Daniel Burbank and Heidemarie Stefanyshyn-Piper, Pilot Christopher Ferguson and Capt. George Hoggard, who is astronaut rescue team leader. MacLean represents the Canadian Space Agency. The STS-115 crew are at NASA's Kennedy Space Center for Terminal Countdown Demonstration Test activities such as the M-113 training. They will also practice emergency egress from the launch pad and take part in a simulated launch countdown. Liftoff of mission STS-115 aboard Space Shuttle Atlantis is scheduled in a window beginning Aug. 27. Photo credit: NASA/Cory Huston

JSC2006-E-41540 (22 Sept. 2006) --- The astronauts who yesterday completed the successful STS-115 mission are pictured on a dais in a hangar at Ellington Field after returning to Houston from the Kennedy Space Center, site of the Sept. 21 landing of the Space Shuttle Atlantis. JSC Director Michael Coats addresses the crowd on hand for the event. Seated, from left, are astronauts Brent W. Jett Jr., commander; Christopher J. Ferguson, pilot; Joseph R. Tanner, Daniel C. Burbank, Heidemarie M. Stefanyshyn-Piper, and the Canadian Space Agency's Steven G. MacLean, all mission specialists.

KENNEDY SPACE CENTER, FLA. - The STS-115 crew members conclude their emergency egress procedures on Launch Pad 39B. In the foreground is Mission Specialist Steven MacLean, who is with the Canadian Space Agency. At right is Mission Specialist Joseph Tanner. At far left is Mission Specialist Heidemarie Stefanyshyn-Piper. The TCDT is a prelaunch preparation for the mission that is scheduled to lift off in a window opening Aug. 27. During their 11-day mission to the International Space Station, the STS-115 crew will continue construction of the station and attach the payload elements, the Port 3/4 truss segment with its two large solar arrays. Photo credit: NASA/Cory Huston

JSC2002-02126 (3 December 2002) --- Members of the STS-115 crew are briefed by United Space Alliance (USA) crew trainer David Pogue (standing) during an emergency egress training session in the Space Vehicle Mockup Facility at the Johnson Space Center (JSC). From the left are astronauts Christopher J. Ferguson, Brent W. Jett, Jr., pilot and mission commander, respectively; Daniel C. Burbank, Joseph R. (Joe) Tanner, Heidemarie M. Stefanyshyn-Piper, and Steven G. MacLean, all mission specialists. The crew is wearing training versions of the shuttle launch and entry suit. MacLean represents the Canadian Space Agency.

KENNEDY SPACE CENTER, FLA. - Just before dawn, Atlantis touches down on Runway 33 at NASA's Kennedy Space Center, concluding mission STS-115. Aboard are Commander Brent Jett, Pilot Christopher Ferguson, and Mission Specialists Joseph Tanner, David Burbank, Heidemarie Stefanyshyn-Piper and Steven MacLean, who represents the Canadian Space Agency. During the mission, Tanner, McLean, Burbank and Piper completed three spacewalks to attach the P3/P4 integrated truss structure to the International Space Station. Main gear touchdown was at 6:21:30 a.m. EDT. Nose gear touchdown was at 6:21:36 a.m. and wheel stop was at 6:22:16 a.m. At touchdown -- nominally about 2,500 ft. beyond the runway threshold -- the orbiter is traveling at a speed ranging from 213 to 226 mph. Atlantis traveled 4.9 million miles, landing on orbit 187. Mission elapsed time was 11 days, 19 hours, six minutes. This is the 15th night landing at KSC and the 23rd night landing overall. Photo credit: NASA/George Shelton

KENNEDY SPACE CENTER, FLA. - Concluding mission STS-115, Atlantis and her crew return to Kennedy Space Center and approach a landing before sunrise on Runway 33. Aboard are Commander Brent Jett, Pilot Christopher Ferguson, and Mission Specialists Joseph Tanner, David Burbank, Heidemarie Stefanyshyn-Piper and Steven MacLean, who represents the Canadian Space Agency. During the mission, Tanner, McLean, Burbank and Piper completed three spacewalks to attach the P3/P4 integrated truss structure to the International Space Station. Main gear touchdown was at 6:21:30 a.m. EDT. Nose gear touchdown was at 6:21:36 a.m. and wheel stop was at 6:22:16 a.m. At touchdown -- nominally about 2,500 ft. beyond the runway threshold -- the orbiter is traveling at a speed ranging from 213 to 226 mph. Atlantis traveled 4.9 million miles, landing on orbit 187. Mission elapsed time was 11 days, 19 hours, six minutes. This is the 15th night landing at KSC and the 23rd night landing overall. Photo credit: NASA/Kim Shiflett

KENNEDY SPACE CENTER, FLA. - Lit from behind, Atlantis is close to touchdown on Runway 33 at NASA's Kennedy Space Center, concluding mission STS-115. Aboard are Commander Brent Jett, Pilot Christopher Ferguson, and Mission Specialists Joseph Tanner, David Burbank, Heidemarie Stefanyshyn-Piper and Steven MacLean, who represents the Canadian Space Agency. During the mission, Tanner, McLean, Burbank and Piper completed three spacewalks to attach the P3/P4 integrated truss structure to the International Space Station. Main gear touchdown was at 6:21:30 a.m. EDT. Nose gear touchdown was at 6:21:36 a.m. and wheel stop was at 6:22:16 a.m. At touchdown -- nominally about 2,500 ft. beyond the runway threshold -- the orbiter is traveling at a speed ranging from 213 to 226 mph. Atlantis traveled 4.9 million miles, landing on orbit 187. Mission elapsed time was 11 days, 19 hours, six minutes. This is the 15th night landing at KSC and the 23rd night landing overall. Photo credit: NASA/Mike Kerley

KENNEDY SPACE CENTER, FLA. - Just before dawn, Atlantis nears touchdown on Runway 33 at NASA's Kennedy Space Center, concluding mission STS-115. Aboard are Commander Brent Jett, Pilot Christopher Ferguson, and Mission Specialists Joseph Tanner, David Burbank, Heidemarie Stefanyshyn-Piper and Steven MacLean, who represents the Canadian Space Agency. During the mission, Tanner, McLean, Burbank and Piper completed three spacewalks to attach the P3/P4 integrated truss structure to the International Space Station. Main gear touchdown was at 6:21:30 a.m. EDT. Nose gear touchdown was at 6:21:36 a.m. and wheel stop was at 6:22:16 a.m. At touchdown -- nominally about 2,500 ft. beyond the runway threshold -- the orbiter is traveling at a speed ranging from 213 to 226 mph. Atlantis traveled 4.9 million miles, landing on orbit 187. Mission elapsed time was 11 days, 19 hours, six minutes. This is the 15th night landing at KSC and the 23rd night landing overall. Photo credit: NASA/John Kechele

KENNEDY SPACE CENTER, FLA. - The drag chute glows in the lights illuminating Atlantis as it touches down on Runway 33 at NASA's Kennedy Space Center, concluding mission STS-115. Aboard are Commander Brent Jett, Pilot Christopher Ferguson, and Mission Specialists Joseph Tanner, David Burbank, Heidemarie Stefanyshyn-Piper and Steven MacLean, who represents the Canadian Space Agency. During the mission, Tanner, McLean, Burbank and Piper completed three spacewalks to attach the P3/P4 integrated truss structure to the International Space Station. Main gear touchdown was at 6:21:30 a.m. EDT. Nose gear touchdown was at 6:21:36 a.m. and wheel stop was at 6:22:16 a.m. At touchdown -- nominally about 2,500 ft. beyond the runway threshold -- the orbiter is traveling at a speed ranging from 213 to 226 mph. Atlantis traveled 4.9 million miles, landing on orbit 187. Mission elapsed time was 11 days, 19 hours, six minutes. This is the 15th night landing at KSC and the 23rd night landing overall. Photo credit: NASA/Mike Kerley

KENNEDY SPACE CENTER, FLA. - Just before dawn, Atlantis nears touchdown on Runway 33 at NASA's Kennedy Space Center, concluding mission STS-115. Aboard are Commander Brent Jett, Pilot Christopher Ferguson, and Mission Specialists Joseph Tanner, David Burbank, Heidemarie Stefanyshyn-Piper and Steven MacLean, who represents the Canadian Space Agency. During the mission, Tanner, McLean, Burbank and Piper completed three spacewalks to attach the P3/P4 integrated truss structure to the International Space Station. Main gear touchdown was at 6:21:30 a.m. EDT. Nose gear touchdown was at 6:21:36 a.m. and wheel stop was at 6:22:16 a.m. At touchdown -- nominally about 2,500 ft. beyond the runway threshold -- the orbiter is traveling at a speed ranging from 213 to 226 mph. Atlantis traveled 4.9 million miles, landing on orbit 187. Mission elapsed time was 11 days, 19 hours, six minutes. This is the 15th night landing at KSC and the 23rd night landing overall. Photo credit: NASA/George Shelton

KENNEDY SPACE CENTER, FLA. - Concluding mission STS-115, Atlantis and her crew return to Kennedy Space Center and approach a landing before sunrise on Runway 33. Aboard are Commander Brent Jett, Pilot Christopher Ferguson, and Mission Specialists Joseph Tanner, David Burbank, Heidemarie Stefanyshyn-Piper and Steven MacLean, who represents the Canadian Space Agency. During the mission, Tanner, McLean, Burbank and Piper completed three spacewalks to attach the P3/P4 integrated truss structure to the International Space Station. Main gear touchdown was at 6:21:30 a.m. EDT. Nose gear touchdown was at 6:21:36 a.m. and wheel stop was at 6:22:16 a.m. At touchdown -- nominally about 2,500 ft. beyond the runway threshold -- the orbiter is traveling at a speed ranging from 213 to 226 mph. Atlantis traveled 4.9 million miles, landing on orbit 187. Mission elapsed time was 11 days, 19 hours, six minutes This is the 15th night landing at KSC and the 23rd night landing overall. Photo credit: NASA/Kim Shiflett

KENNEDY SPACE CENTER, FLA. - Atlantis releases its drag chute to assist in landing on Runway 33 at NASA's Kennedy Space Center, concluding mission STS-115. Aboard are Commander Brent Jett, Pilot Christopher Ferguson, and Mission Specialists Joseph Tanner, David Burbank, Heidemarie Stefanyshyn-Piper and Steven MacLean, who represents the Canadian Space Agency. During the mission, Tanner, McLean, Burbank and Piper completed three spacewalks to attach the P3/P4 integrated truss structure to the International Space Station. Main gear touchdown was at 6:21:30 a.m. EDT. Nose gear touchdown was at 6:21:36 a.m. and wheel stop was at 6:22:16 a.m. At touchdown -- nominally about 2,500 ft. beyond the runway threshold -- the orbiter is traveling at a speed ranging from 213 to 226 mph. Atlantis traveled 4.9 million miles, landing on orbit 187. Mission elapsed time was 11 days, 19 hours, six minutes. This is the 15th night landing at KSC and the 23rd night landing overall. Photo credit: NASA/Chuck Tintera

KENNEDY SPACE CENTER, FLA. - Just before dawn, Atlantis approaches touchdown on Runway 33 at NASA's Kennedy Space Center, concluding mission STS-115. Aboard are Commander Brent Jett, Pilot Christopher Ferguson, and Mission Specialists Joseph Tanner, David Burbank, Heidemarie Stefanyshyn-Piper and Steven MacLean, who represents the Canadian Space Agency. During the mission, Tanner, McLean, Burbank and Piper completed three spacewalks to attach the P3/P4 integrated truss structure to the International Space Station. Main gear touchdown was at 6:21:30 a.m. EDT. Nose gear touchdown was at 6:21:36 a.m. and wheel stop was at 6:22:16 a.m. At touchdown -- nominally about 2,500 ft. beyond the runway threshold -- the orbiter is traveling at a speed ranging from 213 to 226 mph. Atlantis traveled 4.9 million miles, landing on orbit 187. Mission elapsed time was 11 days, 19 hours, six minutes. This is the 15th night landing at KSC and the 23rd night landing overall. Photo credit: NASA/Mike Kerley

KENNEDY SPACE CENTER, FLA. - In the Orbiter Processing Facility, STS-115 crew members look over the cockpit on the orbiter Atlantis, the designated launch vehicle for their mission. From left are Mission Specialists Joseph Tanner, Daniel Burbank, Heidemarie Stefanyshyn-Piper and Steven MacLean, who represents the Canadian Space Agency. The crew is at the center for Crew Equipment Interface Test activities, which involves equipment familiarization, a routine part of astronaut training and launch preparations. The mission will deliver the second port truss segment, the P3/P4 Truss, to attach to the first port truss segment, the P1 Truss, as well as deploy solar array set 2A and 4A. Launch on Space Shuttle Atlantis is scheduled for late August. Photo credit: NASA/Kim Shiflett

KENNEDY SPACE CENTER, FLA. - The crew of mission STS-115 stop to talk to the media after arriving at NASA Kennedy Space Center's Shuttle Landing Facility to prepare for launch on Aug. 27 to the International Space Station. Seen here, left to right, are Mission Specialists Joseph Tanner, Heidemarie Stefanyshyn-Piper and Steven MacLean (at the microphone), and Commander Brent Jett. The mission will deliver and install the 17-and-a-half-ton P3/P4 truss segment to the port side of the integrated truss system on the orbital outpost. The truss includes a new set of photovoltaic solar arrays. When unfurled to their full length of 240 feet, the arrays will provide additional power for the station in preparation for the delivery of international science modules over the next two years. STS-115 is expected to last 11 days and includes three scheduled spacewalks. Photo credit: NASA/Kim Shiflett

KENNEDY SPACE CENTER, FLA. - After a safe landing aboard Atlantis on Runway 33 of the Shuttle Landing Facility, the STS-115 crew greets the media. At the microphone is Commander Brent Jett. Behind him, left to right, are Mission Specialist Daniel Burbank, Pilot Christopher Ferguson and Mission Specialists Steven MacLean, Joseph Tanner and Heidemarie Stefanyshyn-Piper. During the mission, astronauts completed three spacewalks to attach the P3/P4 integrated truss structure to the International Space Station. Main gear touchdown was at 6:21:30 a.m. EDT. Nose gear touchdown was at 6:21:36 a.m. and wheel stop was at 6:22:16 a.m. Atlantis traveled 4.9 million miles, landing on orbit 187. Mission elapsed time was 11 days, 19 hours, six minutes. This is the 15th night landing at KSC and the 23rd night landing overall. Photo credit: NASA/Kim Shiflett

KENNEDY SPACE CENTER, FLA. - The STS-115 crew gets instructions on landing the slidewire baskets, used during emergency egress from the launch pad. Visible from left are Pilot Chris Ferguson, Mission Specialist Joseph Tanner, Commander Brent Jett, Mission Specialist Steven MacLean, who is with the Canadian Space Agency. Partially hidden behind them are Mission Specialists Heidemarie Stefanyshyn-Piper and Daniel Burbank. The mission crew is at KSC for Terminal Countdown Demonstration Test (TCDT) activities that are preparation for launch on Space Shuttle Atlantis, scheduled to take place in a window that opens Aug. 27. During their 11-day mission to the International Space Station, the STS-115 crew will continue construction of the station and attach the payload elements, the Port 3/4 truss segment with its two large solar arrays. Photo credit: NASA/Cory Huston

KENNEDY SPACE CENTER, FLA. - The STS-115 crew gets instructions about using the slidewire baskets for emergency egress from the space shuttle on the pad. Seen here are Mission Specialists Heidemarie Stefanyshyn-Piper and Daniel Burbank, Pilot Chris Ferguson, Mission Specialist Steven MacLean and Commander Brent Jett. MacLean is with the Canadian Space Agency. Not seen is Mission Specialist Joseph Tanner. The mission crew is at KSC for Terminal Countdown Demonstration Test (TCDT) activities that are preparation for launch on Space Shuttle Atlantis, scheduled to take place in a window that opens Aug. 27. During their 11-day mission to the International Space Station, the STS-115 crew will continue construction of the station and attach the payload elements, the Port 3/4 truss segment with its two large solar arrays. Photo credit: NASA/Cory Huston

KENNEDY SPACE CENTER, FLA. - Sitting inside the M-113 armored personnel carrier, the STS-115 crew members get instructions from Capt. George Hoggard, who is astronaut rescue team leader. The astronauts at left are Mission Specialist Heidemarie Stefanyshyn-Piper and Pilot Christopher Ferguson. At right are Commander Brent Jett and Mission Specialists Joseph Tanner and Daniel Burbank. Not seen is Mission Specialist Steven MacLean, who represents the Canadian Space Agency. The STS-115 crew are at NASA's Kennedy Space Center for Terminal Countdown Demonstration Test activities such as the M-113 training. They will also practice emergency egress from the launch pad and take part in a simulated launch countdown. Liftoff of mission STS-115 aboard Space Shuttle Atlantis is scheduled in a window beginning Aug. 27. Photo credit: NASA/Cory Huston

KENNEDY SPACE CENTER, FLA. - The STS-115 crew gets instructions on landing the slidewire baskets, used during emergency egress from the launch pad. From left are Mission Specialists Joseph Tanner and Heidemarie Stefanyshyn-Piper, Commander Brent Jett, and Mission Specialists Daniel Burbank, Chris Ferguson and Steven MacLean, who is with the Canadian Space Agency. The mission crew is at KSC for Terminal Countdown Demonstration Test (TCDT) activities that are preparation for launch on Space Shuttle Atlantis, scheduled to take place in a window that opens Aug. 27. During their 11-day mission to the International Space Station, the STS-115 crew will continue construction of the station and attach the payload elements, the Port 3/4 truss segment with its two large solar arrays. Photo credit: NASA/Cory Huston

KENNEDY SPACE CENTER, FLA. - In the payload changeout room on Launch Pad 39B, STS-115 crew members look over the mission payload one more time before launch. From left are mission specialists Heidemarie Stefanyshyn-Piper and Steven MacLean, who represents the Canadian Space Agency. The mission crew has been at KSC to take part in Terminal Countdown Demonstration Test activities, which include emergency egress training, a simulated launch countdown and the payload familiarization. The TCDT is a prelaunch preparation for the mission that is scheduled to lift off in a window opening Aug. 27. During their 11-day mission to the International Space Station, the STS-115 crew will continue construction of the station and attach the payload elements, the Port 3/4 truss segment with its two large solar arrays. Photo credit: NASA/Cory Huston

KENNEDY SPACE CENTER, FLA. - The STS-115 crew gets instructions about using the slidewire baskets for emergency egress from the space shuttle on the pad. From left are Commander Brent Jett and Mission Specialists Steven MacLean, Heidemarie Stefanyshyn-Piper and Joseph Tanner. MacLean is with the Canadian Space Agency. Not pictured are Pilot Chris Ferguson and Mission Specialist Daniel Burbank. The mission crew is at KSC for Terminal Countdown Demonstration Test (TCDT) activities that are preparation for launch on Space Shuttle Atlantis, scheduled to take place in a window that opens Aug. 27. During their 11-day mission to the International Space Station, the STS-115 crew will continue construction of the station and attach the payload elements, the Port 3/4 truss segment with its two large solar arrays. Photo credit: NASA/Cory Huston

KENNEDY SPACE CENTER, FLA. - The STS-115 crew responds to questions from the media at a press conference on Launch Pad 39B. Seen left to right are Commander Brent Jett, Mission Specialist Steven MacLean, Pilot Chris Ferguson, and Mission Specialists Daniel Burbank, Heidemarie Stefanyshyn-Piper and Joseph Tanner. MacLean is with the Canadian Space Agency. The mission crew is at KSC for Terminal Countdown Demonstration Test activities that are preparation for launch on Space Shuttle Atlantis, scheduled to take place in a window that opens Aug. 27. The TCDT culminates in a simulated launch countdown. During their 11-day mission to the International Space Station, the STS-115 crew will continue construction of the station and attach the payload elements, the Port 3/4 truss segment with its two large solar arrays. Photo credit: NASA/Cory Huston

KENNEDY SPACE CENTER, FLA. - The crew of mission STS-115 stop to talk to the media after arriving at NASA Kennedy Space Center's Shuttle Landing Facility to prepare for launch on Aug. 27 to the International Space Station. Seen here, left to right, are Mission Specialists Steven MacLean and Daniel Burbank, Pilot Christopher Ferguson, Commander Brent Jett, and Mission Specialists Heidemarie Stefanyshyn-Piper and Joseph Tanner. The mission will deliver and install the 17-and-a-half-ton P3/P4 truss segment to the port side of the integrated truss system on the orbital outpost. The truss includes a new set of photovoltaic solar arrays. When unfurled to their full length of 240 feet, the arrays will provide additional power for the station in preparation for the delivery of international science modules over the next two years. STS-115 is expected to last 11 days and includes three scheduled spacewalks. Photo credit: NASA/Kim Shiflett

KENNEDY SPACE CENTER, FLA. - The STS-115 crew is in the White Room on the orbiter access arm on Launch Pad 39B to get instruction on using the emergency egress system. From left are Pilot Chris Ferguson, Commander Brent Jett, and Mission Specialists Heidemarie Stefanyshyn-Piper, Joseph Tanner, Steven MacLean and Daniel Burbank. MacLean is with the Canadian Space Agency. The White Room provides access into the orbiter through the crew access hatch. The mission crew is at KSC for Terminal Countdown Demonstration Test (TCDT) activities that are preparation for launch on Space Shuttle Atlantis, scheduled to take place in a window that opens Aug. 27. During their 11-day mission to the International Space Station, the STS-115 crew will continue construction of the station and attach the payload elements, the Port 3/4 truss segment with its two large solar arrays. Photo credit: NASA/Cory Huston

KENNEDY SPACE CENTER, FLA. - In the payload changeout room on Launch Pad 39B, STS-115 crew members look over the mission payload one more time before launch. From left are mission specialists Heidemarie Stefanyshyn-Piper, Steven MacLean, representing the Canadian Space Agency, Daniel Burbank and Joseph Tanner. The mission crew has been at KSC to take part in Terminal Countdown Demonstration Test activities, which include emergency egress training, a simulated launch countdown and the payload familiarization. The TCDT is a prelaunch preparation for the mission that is scheduled to lift off in a window opening Aug. 27. During their 11-day mission to the International Space Station, the STS-115 crew will continue construction of the station and attach the payload elements, the Port 3/4 truss segment with its two large solar arrays. Photo credit: NASA/Cory Huston

STS115-S-051 (21 Sept. 2006) --- With drag chute deployed, Space Shuttle Atlantis slows to a stop after landing on runway 33 at Kennedy Space Center's Shuttle Landing Facility at 6:21:36 a.m. (EDT) on Sept. 21, 2006. Onboard were astronauts Brent W. Jett, Jr., STS-115 commander; Christopher J. Ferguson, pilot; Joseph R. Tanner, Daniel C. Burbank, Heidemarie M. Stefanyshyn-Piper, and Canadian Space Agency astronaut Steven G. MacLean, all mission specialists. The return of Atlantis concludes the successful nearly 12-day mission to resume construction of the International Space Station by installing the P3/P4 integrated truss and solar arrays.

KENNEDY SPACE CENTER, FLA. - In the Orbiter Processing Facility, STS-115 Mission Speciailsts Steven MacLean and Heidemarie Stefanyshyn-Piper (center) review procedures for launch while inspecting the orbiter Atlantis. The crew is at KSC for Crew Equipment Interface Test activities, which involve equipment familiarization and inspection, a routine part of astronaut training and launch preparations. The STS-115 mission will deliver the second port truss segment, the P3/P4 truss, to the International Space Station. The crew will attach the P3 to the first port truss segment, the P1 truss, as well as deploy solar array set 2A and 4A. Launch on Space Shuttle Atlantis is scheduled for late August. Photo credit: NASA/Kim Shiflett

KENNEDY SPACE CENTER, FLA. - The STS-115 crew members talk about their upcoming driving practice on the M-113 armored personnel carrier with Capt. George Hoggard (back to camera), who is astronaut rescue team leader. The astronauts seen, left to right, are Mission Specialists Heidemarie Stefanyshyn-Piper, Dan Burbank, Steven MacLean and Joe Tanner, and Pilot Christopher Ferguson. Not visible is Commander Brent Jett. MacLean represents the Canadian Space Agency. The STS-115 crew are at NASA's Kennedy Space Center for Terminal Countdown Demonstration Test activities such as the M-113 training. They will also practice emergency egress from the launch pad and take part in a simulated launch countdown. Liftoff of mission STS-115 aboard Space Shuttle Atlantis is scheduled in a window beginning Aug. 27. Photo credit: NASA/Cory Huston

KENNEDY SPACE CENTER, FLA. - At a post-landing press conference at NASA's Kennedy Space Center, the STS-115 crew answer questions from the media about their mission. Seated from left are Commander Brent Jett, Pilot Christopher Ferguson, and Mission Specialists Joseph Tanner, Daniel Burbank, Heidemarie Stefanyshyn-Piper and Steven MacLean, who represents the Canadian Space Agency. During the mission to the International Space Station, astronauts delivered and installed the massive P3/P4 truss, an integral part of the station's backbone, and two sets of solar arrays that will eventually provide one quarter of the station's power. After 11 days, 19 hours and 6 minutes in space, the crew returned to Earth aboard Atlantis at 6:21:30 a.m. EDT. Photo credit: NASA/Cory Huston

STS115-S-052 (21 Sept. 2006) --- Just before dawn, the Space Shuttle Atlantis' main landing gear is about to touch down on runway 33 at Kennedy Space Center's Shuttle Landing Facility. Landing occurred at 6:21:36 a.m. (EDT) on Sept. 21, 2006. Onboard were astronauts Brent W. Jett, Jr., STS-115 commander; Christopher J. Ferguson, pilot; Joseph R. Tanner, Daniel C. Burbank, Heidemarie M. Stefanyshyn-Piper, and Canadian Space Agency astronaut Steven G. MacLean, all mission specialists. The return of Atlantis concludes the successful nearly 12-day mission to resume construction of the International Space Station by installing the P3/P4 integrated truss and solar arrays.

STS115-S-007 (9 Sept. 2006) --- After suiting up, the STS-115 crewmembers exit the Operations and Checkout Building to board the Astrovan, which will take them to launch pad 39B at Kennedy Space Center. On the right (front to back) are astronauts Brent W. Jett, Jr., commander; Daniel C. Burbank and Joseph R. Tanner, both mission specialists. On the left (front to back) are astronauts Christopher J. Ferguson, pilot; Steven G. MacLean representing the Canadian Space Agency and Heidemarie M. Stefanyshyn-Piper, both mission specialists. During the STS-115 mission, Atlantis' astronauts will deliver and install the 17.5-ton, bus-sized P3/P4 integrated truss segment on the station. The girder-like truss includes a set of giant solar arrays, batteries and associated electronics and will provide one-fourth of the total power-generation capability for the completed station.

First Lady Hillary Rodham Clinton is greeted by Astronaut Nancy Jane Currie upon Mrs. Clinton's arrival at the Skid Strip at Cape Canaveral Air Station. Waiting at left are Astronauts Heidemarie M. Stefanyshyn-Piper and Steven W. Lindsey. Mrs. Clinton and her daughter, Chelsea (far right) are here to view the launch of Space Shuttle mission STS-93, scheduled for 12:36 a.m. EDT July 20. Much attention has been generated over the launch due to Commander Eileen M. Collins, the first woman to serve as commander of a Shuttle mission. The primary payload of the five-day mission is the Chandra X-ray Observatory, which will allow scientists from around the world to study some of the most distant, powerful and dynamic objects in the universe. The new telescope is 20 to 50 times more sensitive than any previous X-ray telescope and is expected to unlock the secrets of supernovae, quasars and black holes

KENNEDY SPACE CENTER, FLA. - Following a simulated launch countdown and emergency egress practice, the STS-115 crew gathers on the 215-foot level of the fixed service structure on Launch Pad 39B. From left are Pilot Christopher Ferguson, Mission Specialists Heidemarie Stefanyshyn-Piper and Joseph Tanner, Commander Brent Jett, and Mission Specialists Steven MacLean and Daniel Burbank. MacLean is with the Canadian Space Agency. The TCDT is a prelaunch preparation for the mission that is scheduled to lift off in a window opening Aug. 27. During their 11-day mission to the International Space Station, the STS-115 crew will continue construction of the station and attach the payload elements, the Port 3/4 truss segment with its two large solar arrays. Photo credit: NASA/Cory Huston

KENNEDY SPACE CENTER, FLA. - In the payload changeout room on Launch Pad 39B, STS-115 crew members look over the mission payload one more time before launch. In front is mission specialist Heidemarie Stefanyshyn-Piper. Mission specialist Joseph Tanner is holding a camera, and behind him is mission specialist Steven MacLean, representing the Canadian Space Agency. The mission crew has been at KSC to take part in Terminal Countdown Demonstration Test activities, which include emergency egress training, a simulated launch countdown and the payload familiarization. The TCDT is a prelaunch preparation for the mission that is scheduled to lift off in a window opening Aug. 27. During their 11-day mission to the International Space Station, the STS-115 crew will continue construction of the station and attach the payload elements, the Port 3/4 truss segment with its two large solar arrays. Photo credit: NASA/Cory Huston

KENNEDY SPACE CENTER, FLA. - At a post-landing press conference at NASA's Kennedy Space Center, the STS-115 crew members smile at a question from the media. Seated from left are Commander Brent Jett, Pilot Christopher Ferguson, and Mission Specialists Joseph Tanner, Daniel Burbank, Heidemarie Stefanyshyn-Piper and Steven MacLean, who represents the Canadian Space Agency. During the mission to the International Space Station, astronauts delivered and installed the massive P3/P4 truss, an integral part of the station's backbone, and two sets of solar arrays that will eventually provide one quarter of the station's power. After 11 days, 19 hours and 6 minutes in space, the crew returned to Earth aboard Atlantis at 6:21:30 a.m. EDT. Photo credit: NASA/Cory Huston

KENNEDY SPACE CENTER, FLA. - In the payload changeout room on Launch Pad 39B, STS-115 crew members look over the mission payload one more time before launch. Looking up at the payload from left, are mission specialists Steven MacLean, who represents the Canadian Space Agency, Heidemarie Stefanyshyn-Piper, Joseph Tanner, and Daniel Burbank. The mission crew has been at KSC to take part in Terminal Countdown Demonstration Test activities, which include emergency egress training, a simulated launch countdown and the payload familiarization. The TCDT is a prelaunch preparation for the mission that is scheduled to lift off in a window opening Aug. 27. During their 11-day mission to the International Space Station, the STS-115 crew will continue construction of the station and attach the payload elements, the Port 3/4 truss segment with its two large solar arrays. Photo credit: NASA/Cory Huston

KENNEDY SPACE CENTER, FLA. - The STS-115 crew responds to questions from the media at a press conference held on Launch Pad 39B. Seen left to right are Commander Brent Jett, Mission Specialist Steven MacLean, Pilot Chris Ferguson, and Mission Specialist Daniel Burbank. Crew members not seen are Mission Specialists Heidemarie Stefanyshyn-Piper and Joseph Tanner. MacLean is with the Canadian Space Agency. The mission crew is at KSC for Terminal Countdown Demonstration Test activities that are preparation for launch on Space Shuttle Atlantis, scheduled to take place in a window that opens Aug. 27. The TCDT culminates in a simulated launch countdown. During their 11-day mission to the International Space Station, the STS-115 crew will continue construction of the station and attach the payload elements, the Port 3/4 truss segment with its two large solar arrays. Photo credit: NASA/Cory Huston

KENNEDY SPACE CENTER, FLA. - In the payload changeout room on Launch Pad 39B, STS-115 crew members look over the mission payload one more time before launch. From left are mission specialists Heidemarie Stefanyshyn-Piper, Steven MacLean, representing the Canadian Space Agency, Daniel Burbank and Joseph Tanner. The mission crew has been at KSC to take part in Terminal Countdown Demonstration Test activities, which include emergency egress training, a simulated launch countdown and the payload familiarization. The TCDT is a prelaunch preparation for the mission that is scheduled to lift off in a window opening Aug. 27. During their 11-day mission to the International Space Station, the STS-115 crew will continue construction of the station and attach the payload elements, the Port 3/4 truss segment with its two large solar arrays. Photo credit: NASA/Cory Huston

KENNEDY SPACE CENTER, FLA. - After their arrival at KSC's Shuttle Landing Facility, the STS-115 crew poses for a photo after talking to the media. From left are Mission Specialists Daniel Burbank, Steven MacLean, Joseph Tanner and Heidemarie Stefanyshyn-Piper; Commander Brent Jett; and Pilot Christopher Ferguson. The STS-115 crew has flown to NASA's Kennedy Space Center to take part in Terminal Countdown Demonstration Test activities. The TCDT is a pre-launch preparation that includes practicing emergency egress from the pad, driving an M-113 armored personnel carrier, and simulating the launch countdown. Launch of STS-115 is currently scheduled for Aug. 27. Photo credit: NASA/George Shelton

ISS013-E-81637 (16 Sept. 2006) --- The Expedition 13 and STS-115 crewmembers gather for a group portrait during a joint crew press conference in the Destiny laboratory of the International Space Station while Space Shuttle Atlantis was docked with the station. From the left (front row) are European Space Agency (ESA) astronaut Thomas Reiter, Expedition 13 flight engineer; cosmonaut Pavel V. Vinogradov, commander representing Russia's Federal Space Agency; and astronaut Jeffrey N. Williams, NASA space station science officer and flight engineer. From the left (second row) are astronauts Joseph R. Tanner, Heidemarie M. Stefanyshyn-Piper, both STS-115 mission specialists; and Brent W. Jett, Jr., STS-115 commander. From the left (top row) are astronauts Christopher J. Ferguson, pilot; Daniel C. Burbank and Canadian Space Agency astronaut Steven G. MacLean, both mission specialists.

KENNEDY SPACE CENTER, FLA. - In the Orbiter Processing Facility, STS-115 Mission Specialist Joseph Tanner gets familiar with a camera that is a mockup of one the crew will use to take photographs on-orbit. With him are Mission Specialists Steven MacLean, who represents the Canadian Space Agency, and Heidemarie Stefanyshyn-Piper. The crew is at the center for Crew Equipment Interface Test activities, which involves equipment familiarization, a routine part of astronaut training and launch preparations. The mission will deliver the second port truss segment, the P3/P4 Truss, to attach to the first port truss segment, the P1 Truss, as well as deploy solar array set 2A and 4A. Launch on Space Shuttle Atlantis is scheduled for late August. Photo credit: NASA/Kim Shiflett

KENNEDY SPACE CENTER, FLA. - After successfully completing their driving practice on the M-113 armored personnel carrier behind them, the STS-115 crew poses for a photo. From left are Pilot Christopher Ferguson, Mission Specialists Steven MacLean, Heidemarie Stefanyshyn-Piper, Joseph Tanner and Daniel Burbank, and Commander Brent Jett. The STS-115 crew are at NASA's Kennedy Space Center for Terminal Countdown Demonstration Test activities such as the M-113 training. They will also practice emergency egress from the launch pad and take part in a simulated launch countdown. Liftoff of mission STS-115 aboard Space Shuttle Atlantis is scheduled in a window beginning Aug. 27. Photo credit: NASA/Cory Huston

ISS013-E-81630 (16 Sept. 2006) --- The Expedition 13 and STS-115 crewmembers gather for a group portrait during a joint crew press conference in the Destiny laboratory of the International Space Station while Space Shuttle Atlantis was docked with the station. From the left (front row) are European Space Agency (ESA) astronaut Thomas Reiter, Expedition 13 flight engineer; cosmonaut Pavel V. Vinogradov, commander representing Russia's Federal Space Agency; and astronaut Jeffrey N. Williams, NASA space station science officer and flight engineer. From the left (second row) are astronauts Joseph R. Tanner, Heidemarie M. Stefanyshyn-Piper, both STS-115 mission specialists; and Brent W. Jett, Jr., STS-115 commander. From the left (top row) are astronauts Christopher J. Ferguson, pilot; Daniel C. Burbank and Canadian Space Agency astronaut Steven G. MacLean, both mission specialists.

KENNEDY SPACE CENTER, FLA. - The STS-115 crew pauses for a photo during training on Launch Pad 39B. From left are Mission Commander Brent Jett, Pilot Chris Ferguson, and Mission Specialists Daniel Burbank, Steven MacLean, Heidemarie Stefanyshyn-Piper and Joseph Tanner. The mission crew is at KSC for Terminal Countdown Demonstration Test (TCDT) activities that are preparation for launch on Space Shuttle Atlantis, scheduled to take place in a window that opens Aug. 27. During their 11-day mission to the International Space Station, the STS-115 crew will continue construction of the station and attach the payload elements, the Port 3/4 truss segment with its two large solar arrays. Photo credit: NASA/Cory Huston

KENNEDY SPACE CENTER, FLA. - In the Orbiter Processing Facility, STS-115 Mission Specialist Joseph Tanner practices using a camera that is a mockup of one the crew will use to take photographs on-orbit. With him are Mission Specialists Steven MacLean, who represents the Canadian Space Agency, and Heidemarie Stefanyshyn-Piper. The crew is at the center for Crew Equipment Interface Test activities, which involves equipment familiarization, a routine part of astronaut training and launch preparations. The mission will deliver the second port truss segment, the P3/P4 Truss, to attach to the first port truss segment, the P1 Truss, as well as deploy solar array set 2A and 4A. Launch on Space Shuttle Atlantis is scheduled for late August. Photo credit: NASA/Kim Shiflett

KENNEDY SPACE CENTER, FLA. - The STS-115 crew gets instructions about using the slidewire baskets for emergency egress from the space shuttle on the pad. At center, foreground, is Commander Brent Jett. The others, from left are Mission Specialists Joseph Tanner, gesturing, Steven MacLean, Daniel Burbank and Heidemarie Stefanyshyn-Piper. MacLean is with the Canadian Space Agency. The mission crew is at KSC for Terminal Countdown Demonstration Test (TCDT) activities that are preparation for launch on Space Shuttle Atlantis, scheduled to take place in a window that opens Aug. 27. During their 11-day mission to the International Space Station, the STS-115 crew will continue construction of the station and attach the payload elements, the Port 3/4 truss segment with its two large solar arrays. Photo credit: NASA/Cory Huston

KENNEDY SPACE CENTER, FLA. - STS-115 Pilot Christopher Ferguson takes the wheel to practice driving the M-113 armored personnel carrier. Passengers on the carrier are (from left) Mission Specialists Daniel Burbank and Heidemarie Stefanyshyn-Piper, Capt. George Hoggard, who is astronaut rescue team leader, and Mission Specialist Steven MacLean. The STS-115 crew are at NASA's Kennedy Space Center for Terminal Countdown Demonstration Test activities such as the M-113 training. They will also practice emergency egress from the launch pad and take part in a simulated launch countdown. Liftoff of mission STS-115 aboard Space Shuttle Atlantis is scheduled in a window beginning Aug. 27. Photo credit: NASA/Cory Huston

STS115-S-047 (21 Sept. 2006) --- Just before dawn, the Space Shuttle Atlantis' main landing gear is about to touch down on runway 33 at Kennedy Space Center's Shuttle Landing Facility. Landing occurred at 6:21:36 a.m. (EDT) on Sept. 21, 2006. Onboard were astronauts Brent W. Jett, Jr., STS-115 commander; Christopher J. Ferguson, pilot; Joseph R. Tanner, Daniel C. Burbank, Heidemarie M. Stefanyshyn-Piper, and Canadian Space Agency astronaut Steven G. MacLean, all mission specialists. The return of Atlantis concludes the successful nearly 12-day mission to resume construction of the International Space Station by installing the P3/P4 integrated truss and solar arrays.

KENNEDY SPACE CENTER, FLA. - Following a simulated launch countdown and emergency egress practice, the STS-115 crew gathers on the 215-foot level of the fixed service structure on Launch Pad 39B. From left are Pilot Christopher Ferguson, Mission Specialists Heidemarie Stefanyshyn-Piper and Joseph Tanner, Commander Brent Jett, and Mission Specialists Steven MacLean and Daniel Burbank. MacLean is with the Canadian Space Agency. Behind them loom the top of Space Shuttle Atlantis' external tank and one of the solid rocket boosters. The TCDT is a prelaunch preparation for the mission that is scheduled to lift off in a window opening Aug. 27. During their 11-day mission to the International Space Station, the STS-115 crew will continue construction of the station and attach the payload elements, the Port 3/4 truss segment with its two large solar arrays. Photo credit: NASA/Cory Huston

KENNEDY SPACE CENTER, FLA. - The STS-115 crew responds to questions from the media at a press conference held on Launch Pad 39B. Seen left to right are Commander Brent Jett, Mission Specialist Steven MacLean, Pilot Chris Ferguson, and Mission Specialists Daniel Burbank, Heidemarie Stefanyshyn-Piper and Joseph Tanner. MacLean is with the Canadian Space Agency. The mission crew is at KSC for Terminal Countdown Demonstration Test activities that are preparation for launch on Space Shuttle Atlantis, scheduled to take place in a window that opens Aug. 27. The TCDT culminates in a simulated launch countdown. During their 11-day mission to the International Space Station, the STS-115 crew will continue construction of the station and attach the payload elements, the Port 3/4 truss segment with its two large solar arrays. Photo credit: NASA/Cory Huston

KENNEDY SPACE CENTER, FLA. - The STS-115 crew is in the White Room on the orbiter access arm on Launch Pad 39B to get instruction on using the emergency egress system. From left are Commander Brent Jett, Pilot Chris Ferguson, and Mission Specialists Heidemarie Stefanyshyn-Piper, Joseph Tanner, Steven MacLean and Daniel Burbank. MacLean is with the Canadian Space Agency. he White Room provides access into the orbiter through the crew access hatch. The mission crew is at KSC for Terminal Countdown Demonstration Test (TCDT) activities that are preparation for launch on Space Shuttle Atlantis, scheduled to take place in a window that opens Aug. 27. During their 11-day mission to the International Space Station, the STS-115 crew will continue construction of the station and attach the payload elements, the Port 3/4 truss segment with its two large solar arrays. Photo credit: NASA/Cory Huston

KENNEDY SPACE CENTER, FLA. - The STS-115 crew gets instructions about using the slidewire baskets for emergency egress from the space shuttle on the pad. From left are Commander Brent Jett and Mission Specialists Steven MacLean, Heidemarie Stefanyshyn-Piper and Joseph Tanner, and Pilot Chris Ferguson. MacLean is with the Canadian Space Agency. Not pictured is Mission Specialist Daniel Burbank. The mission crew is at KSC for Terminal Countdown Demonstration Test (TCDT) activities that are preparation for launch on Space Shuttle Atlantis, scheduled to take place in a window that opens Aug. 27. During their 11-day mission to the International Space Station, the STS-115 crew will continue construction of the station and attach the payload elements, the Port 3/4 truss segment with its two large solar arrays. Photo credit: NASA/Cory Huston

KENNEDY SPACE CENTER, FLA. - The STS-115 crew gets instructions on landing the slidewire baskets, used during emergency egress from the launch pad. From left are Mission Specialists Joseph Tanner and Heidemarie Stefanyshyn-Piper, Commander Brent Jett, and Mission Specialists Daniel Burbank, Chris Ferguson and Steven MacLean, who is with the Canadian Space Agency. The mission crew is at KSC for Terminal Countdown Demonstration Test (TCDT) activities that are preparation for launch on Space Shuttle Atlantis, scheduled to take place in a window that opens Aug. 27. During their 11-day mission to the International Space Station, the STS-115 crew will continue construction of the station and attach the payload elements, the Port 3/4 truss segment with its two large solar arrays. Photo credit: NASA/Cory Huston

KENNEDY SPACE CENTER, FLA. - The STS-115 crew responds to questions from the media at a press conference held on Launch Pad 39B. Seen left to right are Commander Brent Jett, Mission Specialist Steven MacLean, Pilot Chris Ferguson, and Mission Specialists Daniel Burbank, Heidemarie Stefanyshyn-Piper and Joseph Tanner. MacLean is with the Canadian Space Agency. The mission crew is at KSC for Terminal Countdown Demonstration Test activities that are preparation for launch on Space Shuttle Atlantis, scheduled to take place in a window that opens Aug. 27. The TCDT culminates in a simulated launch countdown. During their 11-day mission to the International Space Station, the STS-115 crew will continue construction of the station and attach the payload elements, the Port 3/4 truss segment with its two large solar arrays. Photo credit: NASA/Cory Huston

First Lady Hillary Rodham Clinton is greeted by Astronauts (from left) Heidemarie M. Stefanyshyn-Piper, Steven W. Lindsey, and Nancy Jane Currie upon Mrs. Clinton's arrival at the Skid Strip at Cape Canaveral Air Station. She and her daughter, Chelsea (far right) are here to view the launch of Space Shuttle mission STS-93, scheduled for 12:36 a.m. EDT July 20. Much attention has been generated over the launch due to Commander Eileen M. Collins, the first woman to serve as commander of a Shuttle mission. The primary payload of the five-day mission is the Chandra X-ray Observatory, which will allow scientists from around the world to study some of the most distant, powerful and dynamic objects in the universe. The new telescope is 20 to 50 times more sensitive than any previous X-ray telescope and is expected to unlock the secrets of supernovae, quasars and black holes

KENNEDY SPACE CENTER, FLA. - STS-115 crew members take another look at an M-113 armored personnel carrier that could be used to move quickly away from the launch pad in the event of an emergency. From left are Commander Brent Jett, Pilot Chris Ferguson and Mission Specialists Heidemarie Stefanyshyn-Piper and Joseph Tanner. In the foreground are Mission Specialists Daniel Burbank and Steven MacLean, who is with the Canadian Space Agency. The mission crew is at KSC for Terminal Countdown Demonstration Test (TCDT) activities that are preparation for launch on Space Shuttle Atlantis, scheduled to take place in a window that opens Aug. 27. During their 11-day mission to the International Space Station, the STS-115 crew will continue construction of the station and attach the payload elements, the Port 3/4 truss segment with its two large solar arrays. Photo credit: NASA/Cory Huston

STS115-S-044 (21 Sept. 2006) --- Just before dawn, the Space Shuttle Atlantis' main landing gear is about to touch down on runway 33 at Kennedy Space Center's Shuttle Landing Facility. Landing occurred at 6:21:36 a.m. (EDT) on Sept. 21, 2006. Onboard were astronauts Brent W. Jett, Jr., STS-115 commander; Christopher J. Ferguson, pilot; Joseph R. Tanner, Daniel C. Burbank, Heidemarie M. Stefanyshyn-Piper, and Canadian Space Agency astronaut Steven G. MacLean, all mission specialists. The return of Atlantis concludes the successful nearly 12-day mission to resume construction of the International Space Station by installing the P3/P4 integrated truss and solar arrays.

ISS013-E-81626 (16 Sept. 2006) --- The Expedition 13 and STS-115 crewmembers gather for a group portrait during a joint crew press conference in the Destiny laboratory of the International Space Station while Space Shuttle Atlantis was docked with the station. From the left (front row) are European Space Agency (ESA) astronaut Thomas Reiter, Expedition 13 flight engineer; cosmonaut Pavel V. Vinogradov, commander representing Russia's Federal Space Agency; and astronaut Jeffrey N. Williams, NASA space station science officer and flight engineer. From the left (second row) are astronauts Joseph R. Tanner, Heidemarie M. Stefanyshyn-Piper, both STS-115 mission specialists; and Brent W. Jett, Jr., STS-115 commander. From the left (top row) are astronauts Christopher J. Ferguson, pilot; Daniel C. Burbank and Canadian Space Agency astronaut Steven G. MacLean, both mission specialists.

Members of the U.S. Women's World Cup Soccer Team were greeted upon their arrival at the Skid Strip at Cape Canaveral Air Station by Astronauts (right) Steven W. Lindsey, Heidemarie M. Stefanyshyn-Piper and Scott E. Parzynski. The team are here to view the launch of Space Shuttle mission STS-93, scheduled for 12:36 a.m. EDT July 20. Much attention has been generated over the launch due to Commander Eileen M. Collins, the first woman to serve as commander of a Shuttle mission. The primary payload of the five-day mission is the Chandra X-ray Observatory, which will allow scientists from around the world to study some of the most distant, powerful and dynamic objects in the universe. The new telescope is 20 to 50 times more sensitive than any previous X-ray telescope and is expected to unlock the secrets of supernovae, quasars and black holes

S115-E-05509 (11 Sept. 2006) --- Expedition 13 and STS-115 crewmembers reunite onboard the International Space Station soon after its docking with the Space Shuttle Atlantis. Cosmonaut Pavel Vinogradov, Expedition 13 commander representing Russia's Federal Space Agency, floats into the aft end of Unity from one of the pressurized mating adapters (PMA-1). Vinogradov's crewmate, astronaut Jeffrey N. Williams, flight engineer and NASA space station science officer, is in center frame. Canadian astronaut Steven G. MacLean (second left) is standing in the hatch to Quest, next to astronaut Heidemarie M. Stefanyshyn-Piper, mission specialist oon the Atlantis crew. Astronaut Brent W. Jett Jr., the shuttle mission's crew commander, is at right.

KENNEDY SPACE CENTER, FLA. - In the payload changeout room on Launch Pad 39B, STS-115 crew members look over the mission payload one more time before launch. From left are mission specialists Joseph Tanner, Daniel Burbank, Steven MacLean, who represents the Canadian Space Agency, and Heidemarie Stefanyshyn-Piper (standing). The mission crew has been at KSC to take part in Terminal Countdown Demonstration Test activities, which include emergency egress training, a simulated launch countdown and the payload familiarization. The TCDT is a prelaunch preparation for the mission that is scheduled to lift off in a window opening Aug. 27. During their 11-day mission to the International Space Station, the STS-115 crew will continue construction of the station and attach the payload elements, the Port 3/4 truss segment with its two large solar arrays. Photo credit: NASA/Cory Huston

KENNEDY SPACE CENTER, FLA. - In the payload changeout room on Launch Pad 39B, STS-115 crew members look over the mission payload one more time before launch. From left are mission specialists Heidemarie Stefanyshyn-Piper and Steven MacLean, representing the Canadian Space Agency. The mission crew has been at KSC to take part in Terminal Countdown Demonstration Test activities, which include emergency egress training, a simulated launch countdown and the payload familiarization. The TCDT is a prelaunch preparation for the mission that is scheduled to lift off in a window opening Aug. 27. During their 11-day mission to the International Space Station, the STS-115 crew will continue construction of the station and attach the payload elements, the Port 3/4 truss segment with its two large solar arrays. Photo credit: NASA/Cory Huston

KENNEDY SPACE CENTER, FLA. - Following a simulated launch countdown and emergency egress practice, the STS-115 crew gathers on the 215-foot level of the fixed service structure on Launch Pad 39B. From left are Mission Specialists Joseph Tanner and Heidemarie Stefanyshyn-Piper, Commander Brent Jett, Pilot Christopher Ferguson, and Mission Specialists Steven MacLean and Daniel Burbank. MacLean is with the Canadian Space Agency. Behind them loom the top of Space Shuttle Atlantis' external tank and one of the solid rocket boosters. The TCDT is a prelaunch preparation for the mission that is scheduled to lift off in a window opening Aug. 27. During their 11-day mission to the International Space Station, the STS-115 crew will continue construction of the station and attach the payload elements, the Port 3/4 truss segment with its two large solar arrays. Photo credit: NASA/Cory Huston

KENNEDY SPACE CENTER, FLA. - The STS-115 crew is in the White Room on the orbiter access arm on Launch Pad 39B to get instruction on using the emergency egress system. From left are Commander Brent Jett, Pilot Chris Ferguson, and Mission Specialists Heidemarie Stefanyshyn-Piper, Joseph Tanner, Steven MacLean and Daniel Burbank. MacLean is with the Canadian Space Agency. The White Room provides access into the orbiter through the crew access hatch. The mission crew is at KSC for Terminal Countdown Demonstration Test (TCDT) activities that are preparation for launch on Space Shuttle Atlantis, scheduled to take place in a window that opens Aug. 27. During their 11-day mission to the International Space Station, the STS-115 crew will continue construction of the station and attach the payload elements, the Port 3/4 truss segment with its two large solar arrays. Photo credit: NASA/Cory Huston

KENNEDY SPACE CENTER, FLA. - In the Orbiter Processing Facility, STS-115 Mission Specialist Joseph Tanner takes a closer look at the orbiter Atlantis, the designated launch vehicle for the mission.. Looking on (from left) are Mission Specialists Daniel Burbank, Heidemarie Stefanyshyn-Piper and Steven MacLean, who represents the Canadian Space Agency. The crew is at the center for Crew Equipment Interface Test activities, which involves equipment familiarization, a routine part of astronaut training and launch preparations. The mission will deliver the second port truss segment, the P3/P4 Truss, to attach to the first port truss segment, the P1 Truss, as well as deploy solar array set 2A and 4A. Launch on Space Shuttle Atlantis is scheduled for late August. Photo credit: NASA/Kim Shiflett

KENNEDY SPACE CENTER, FLA. - STS-115 Commander Brent Jett introduces his crew to waiting media at KSC's Shuttle Landing Facility after their arrival from Houston. At left are Mission Specialists Daniel Burbank, Steven MacLean and Joseph Tanner; at right are Mission Specialist Heidemarie Stefanyshyn-Piper and Pilot Christopher Ferguson. The STS-115 crew has flown to NASA's Kennedy Space Center to take part in Terminal Countdown Demonstration Test activities. The TCDT is a pre-launch preparation that includes practicing emergency egress from the pad, driving an M-113 armored personnel carrier, and simulating the launch countdown. Launch of STS-115 is currently scheduled for Aug. 27. Photo credit: NASA/George Shelton

KENNEDY SPACE CENTER, FLA. - In the Orbiter Processing Facility, STS-115 crew members examine tiles on the orbiter Atlantis, the designated launch vehicle for their mission. From left are Mission Specialists Heidemarie Stefanyshyn-Piper, Joseph Tanner and Steven MacLean, who represents the Canadian Space Agency. The crew is at the center for Crew Equipment Interface Test activities, which involves equipment familiarization, a routine part of astronaut training and launch preparations. The mission will deliver the second port truss segment, the P3/P4 Truss, to attach to the first port truss segment, the P1 Truss, as well as deploy solar array set 2A and 4A. Launch on Space Shuttle Atlantis is scheduled for late August. Photo credit: NASA/Kim Shiflett

KENNEDY SPACE CENTER, FLA. - In the payload changeout room on Launch Pad 39B, STS-115 crew members look over the mission payload one more time before launch. From front to back are mission specialists Joseph Tanner, Daniel Burbank, Steven MacLean, who represents the Canadian Space Agency, and Heidemarie Stefanyshyn-Piper. The mission crew has been at KSC to take part in Terminal Countdown Demonstration Test activities, which include emergency egress training, a simulated launch countdown and the payload familiarization. The TCDT is a prelaunch preparation for the mission that is scheduled to lift off in a window opening Aug. 27. During their 11-day mission to the International Space Station, the STS-115 crew will continue construction of the station and attach the payload elements, the Port 3/4 truss segment with its two large solar arrays. Photo credit: NASA/Cory Huston

KENNEDY SPACE CENTER, FLA. - The STS-115 crew members are ready to climb into the M-113 armored personnel carrier with Capt. George Hoggard (back to camera), who is astronaut rescue team leader. The astronauts seen, left to right, are Mission Specialist Heidemarie Stefanyshyn-Piper, Commander Brent Jett, Mission Specialists Dan Burbank, Steven MacLean and Joe Tanner, and Pilot Christopher Ferguson. MacLean represents the Canadian Space Agency.The STS-115 crew are at NASA's Kennedy Space Center for Terminal Countdown Demonstration Test activities such as the M-113 training. They will also practice emergency egress from the launch pad and take part in a simulated launch countdown. Liftoff of mission STS-115 aboard Space Shuttle Atlantis is scheduled in a window beginning Aug. 27. Photo credit: NASA/Cory Huston

KENNEDY SPACE CENTER, FLA. - In the Orbiter Processing Facility, STS-115 crew members discuss their examination of the orbiter Atlantis, seen above them. From left are Mission Specialists Steven MacLean, who represents the Canadian Space Agency, Heidemarie Stefanyshyn-Piper, Daniel Burbank and Joseph Tanner. The crew is at the center for Crew Equipment Interface Test activities, which involves equipment familiarization, a routine part of astronaut training and launch preparations. The mission will deliver the second port truss segment, the P3/P4 Truss, to attach to the first port truss segment, the P1 Truss, as well as deploy solar array set 2A and 4A. Launch on Space Shuttle Atlantis is scheduled for late August. Photo credit: NASA/Kim Shiflett

KENNEDY SPACE CENTER, FLA. - The STS-115 crew learn about use of the bunker in the event of an emergency at the launch pad. Seen in the photo are, from left, Commander Brent Jett, Mission Specialists Daniel Burbank and Steven MacLean, Pilot Chris Ferguson and Mission Specialist Joseph Tanner. Not pictured is Mission Specialist Heidemarie Stefanyshyn-Piper. The mission crew is at KSC for Terminal Countdown Demonstration Test (TCDT) activities that are preparation for launch on Space Shuttle Atlantis, scheduled to take place in a window that opens Aug. 27. During their 11-day mission to the International Space Station, the STS-115 crew will continue construction of the station and attach the payload elements, the Port 3/4 truss segment with its two large solar arrays. Photo credit: NASA/Cory Huston

KENNEDY SPACE CENTER, FLA. - The STS-115 mission crew happily heads to the Astrovan for the ride to Launch Pad 39B and another attempt at liftoff. From the left, in the back row are Mission Specialists Heidemarie Stefanyshyn-Piper and Joseph Tanner; in the center row are Mission Specialists Steven MacLean and Daniel Burbank; in the front row leading the way are Pilot Christopher Ferguson and Commander Brent Jett. The launch attempt on Sept. 8 was scrubbed due to an issue with a fuel cut-off sensor system inside the external fuel tank. This is one of several systems that protect the shuttle's main engines by triggering their shutdown if fuel runs unexpectedly low. During the STS-115 mission, Atlantis' astronauts will deliver and install the 17.5-ton, bus-sized P3/P4 integrated truss segment on the station. The girder-like truss includes a set of giant solar arrays, batteries and associated electronics and will provide one-fourth of the total power-generation capability for the completed station. This mission is the 116th space shuttle flight, the 27th flight for orbiter Atlantis, and the 19th U.S. flight to the ISS. STS-115 is scheduled to last 11 days with a planned landing at KSC. Photo credit: NASA/Kim Shiflett

KENNEDY SPACE CENTER, FLA. - After their return from space, the STS-115 crew is welcomed by NASA and KSC officials. The crew members, from left, are Mission Specialists Joseph Tanner and Heidemarie Stefanyshyn-Piper; Pilot Christopher Ferguson; Mission Specialist Steven MacLean; Commander Brent Jett; and Mission Specialist Daniel Burbank. At right are NASA Administrator Michael Griffin, Deputy Associate Administrator for Space Operations Lynn Cline, and a representative of the Canadian Space Agency. During the mission, astronauts completed three spacewalks to attach the P3/P4 integrated truss structure to the International Space Station. Main gear touchdown was at 6:21:30 a.m. EDT. Nose gear touchdown was at 6:21:36 a.m. and wheel stop was at 6:22:16 a.m. At touchdown -- nominally about 2,500 ft. beyond the runway threshold -- the orbiter is traveling at a speed ranging from 213 to 226 mph. Atlantis traveled 4.9 million miles, landing on orbit 187. Mission elapsed time was 11 days, 19 hours, six minutes. This is the 15th night landing at KSC and the 23rd night landing overall. Photo credit: NASA/Kim Shiflett

KENNEDY SPACE CENTER, FLA. - The STS-115 mission crew respond to well-wishers as they head to the Astrovan for the ride to Launch Pad 39B. From left are Pilot Christopher Ferguson, Mission Specialists Steven MacLean, Heidemarie Stefanyshyn-Piper, Daniel Burbank and Joseph Tanner (hidden), and Commander Brent Jett. The crew is eager for another attempt at liftoff after the Sept. 8 scrub. The launch attempt on Sept. 8 was scrubbed due to an issue with a fuel cut-off sensor system inside the external fuel tank. This is one of several systems that protect the shuttle's main engines by triggering their shutdown if fuel runs unexpectedly low. During the STS-115 mission, Atlantis' astronauts will deliver and install the 17.5-ton, bus-sized P3/P4 integrated truss segment on the station. The girder-like truss includes a set of giant solar arrays, batteries and associated electronics and will provide one-fourth of the total power-generation capability for the completed station. This mission is the 116th space shuttle flight, the 27th flight for orbiter Atlantis, and the 19th U.S. flight to the ISS. STS-115 is scheduled to last 11 days with a planned landing at KSC. Photo credit: NASA/Kim Shiflett

KENNEDY SPACE CENTER, FLA. - After a week's delay of launching due to weather and technical issues, the crew of mission STS-115 enjoy the traditional breakfast before their second attempt to launch on Space Shuttle Atlantis. Seated left to right are Mission Specialists Joseph Tanner and Heidemarie Stefanyshyn-Piper, Pilot Christopher Ferguson, Commander Brent Jett and Mission Specialists Steven MacLean and Daniel Burbank. MacLean is with the Canadian Space Agency. Following the breakfast, the crew will don their launch suits before heading to Launch Pad 39B. During the STS-115 mission, Atlantis' astronauts will deliver and install the 17.5-ton, bus-sized P3/P4 integrated truss segment on the station. The girder-like truss includes a set of giant solar arrays, batteries and associated electronics and will provide one-fourth of the total power-generation capability for the completed station. This mission is the 116th space shuttle flight, the 27th flight for orbiter Atlantis, and the 19th U.S. flight to the International Space Station. STS-115 is scheduled to last 11 days with a planned landing at KSC. Photo credit: NASA/Kim Shiflett

KENNEDY SPACE CENTER, FLA. - One of three T-38 jet aircraft with STS-115 crew members aboard lands at NASA Kennedy Space Center's Shuttle Landing Facility. The crew is arriving to prepare for launch on Aug. 27 to the International Space Station. Crew members are Commander Brent Jett, Pilot Christopher Ferguson and Mission Specialists Joseph Tanner, Daniel Burbank, Heidemarie Stefanyshyn-Piper and Steven MacLean, who represents the Canadian Space Agency. The mission will deliver and install the 17-and-a-half-ton P3/P4 truss segment to the port side of the integrated truss system on the orbital outpost. The truss includes a new set of photovoltaic solar arrays. When unfurled to their full length of 240 feet, the arrays will provide additional power for the station in preparation for the delivery of international science modules over the next two years. STS-115 is expected to last 11 days and includes three scheduled spacewalks. Photo credit: NASA/Kim Shiflett

KENNEDY SPACE CENTER, FLA. - After a week's delay of launching due to weather and technical issues, the crew of mission STS-115 have had the traditional breakfast before their third attempt to launch on Space Shuttle Atlantis. Seated left to right are Mission Specialists Heidemarie Stefanyshyn-Piper and Joseph Tanner, Commander Brent Jett, Pilot Christopher Ferguson and Mission Specialists Steven MacLean and Daniel Burbank. MacLean is with the Canadian Space Agency. The launch attempt on Sept. 8 was scrubbed due to an issue with a fuel cut-off sensor system inside the external fuel tank. This is one of several systems that protect the shuttle's main engines by triggering their shutdown if fuel runs unexpectedly low. Following the breakfast, the crew will don their launch suits before heading to Launch Pad 39B. During the STS-115 mission, Atlantis' astronauts will deliver and install the 17.5-ton, bus-sized P3/P4 integrated truss segment on the station. The girder-like truss includes a set of giant solar arrays, batteries and associated electronics and will provide one-fourth of the total power-generation capability for the completed station. This mission is the 116th space shuttle flight, the 27th flight for orbiter Atlantis, and the 19th U.S. flight to the ISS. STS-115 is scheduled to last 11 days with a planned landing at KSC. Photo credit: NASA/Kim Shiflett

KENNEDY SPACE CENTER, FLA. - Three T-38 jet aircraft with STS-115 crew members aboard approach NASA Kennedy Space Center's Shuttle Landing Facility. The crew is arriving to prepare for launch on Aug. 27 to the International Space Station. Crew members are Commander Brent Jett, Pilot Christopher Ferguson and Mission Specialists Joseph Tanner, Daniel Burbank, Heidemarie Stefanyshyn-Piper and Steven MacLean, who represents the Canadian Space Agency. The mission will deliver and install the 17-and-a-half-ton P3/P4 truss segment to the port side of the integrated truss system on the orbital outpost. The truss includes a new set of photovoltaic solar arrays. When unfurled to their full length of 240 feet, the arrays will provide additional power for the station in preparation for the delivery of international science modules over the next two years. STS-115 is expected to last 11 days and includes three scheduled spacewalks. Photo credit: NASA/Kim Shiflett

KENNEDY SPACE CENTER, FLA. - The STS-115 crew walks out of the Operations and Checkout Building to head for Launch Pad 39B. Leading the way on the left is Pilot Christopher Ferguson; behind him are Mission Specialists Steven MacLean and Heidemarie Stefanyshyn-Piper. Leading on the right is Commander Brent Jett; behind him re Mission Specialists Daniel Burbank and Joseph Tanner. MacLean is with the Canadian Space Agency. They are taking part in a simulated launch countdown as part of the preparation for the liftoff of Space Shuttle Atlantis on mission STS-115, scheduled to take place in a window that opens Aug. 27. The mission crew has been at KSC for Terminal Countdown Demonstration Test (TCDT) activities, which include emergency egress training and the simulation. During their 11-day mission to the International Space Station, the crew will continue construction of the station and attach the payload elements, the Port 3/4 truss segment with its two large solar arrays. Photo courtesy of Scott Andrews/Nikon

CAPE CANAVERAL, Fla. – Dressed in their launch-and-entry suits, the STS-126 crew members pause by the Astrovan after walking out of the Operations and Checkout Building at NASA's Kennedy Space Center in Florida. They will head to Launch Pad 39A for a simulated countdown in space shuttle Endeavour. From left are Mission Specialists Sandra Magnus, Shane Kimbrough, Heidemarie Stefanyshyn-Piper, Steven Bowen and Donald Pettit, Pilot Eric Boe and Commander Chris Ferguson. The crew is at Kennedy to take part in the Terminal Countdown Demonstration Test, which includes equipment familiarization, emergency exit training and the simulated countdown. On the STS-126 mission, space shuttle Endeavour's crew will deliver equipment and supplies to the International Space Station in preparation for expansion from a three- to six-person resident crew aboard the complex. The mission also will include four spacewalks to service the station’s Solar Alpha Rotary Joints. Endeavour is targeted to launch Nov. 14. Photo credit: NASA/Kim Shiflett

KENNEDY SPACE CENTER, FLA. - The crew of mission STS-115 arrives at NASA Kennedy Space Center's Shuttle Landing Facility to prepare for launch on Aug. 27 to the International Space Station. They have paused to talk to the media before heading to crew quarters in the Operations and Checkout Building. From left are Mission Specialists Steven MacLean, Joseph Tanner and Heidemarie Stefanyshyn-Piper, Commander Brent Jett, Pilot Christopher Ferguson and Mission Specialist Daniel Burbank. MacLean represents the Canadian Space Agency. The mission will deliver and install the 17-and-a-half-ton P3/P4 truss segment to the port side of the integrated truss system on the orbital outpost. The truss includes a new set of photovoltaic solar arrays. When unfurled to their full length of 240 feet, the arrays will provide additional power for the station in preparation for the delivery of international science modules over the next two years. STS-115 is expected to last 11 days and includes three scheduled spacewalks. Photo credit: NASA/Kim Shiflett

KENNEDY SPACE CENTER, FLA. - The STS-115 crew members stride out of the Operations and Checkout Building eager to get to Launch Pad 39B and the start of their mission to the International Space Station. This is the second attempt at launch after a week's postponement due to weather and technical concerns. On the left side, front to back, are Pilot Christopher Ferguson and Mission Specialists Steven MacLean and Heidemarie Stefanyshyn-Piper. On the right side, front to back, are Commander Brent Jett and Mission Specialists Daniel Burbank and Joseph Tanner. On its second attempt for launch, Atlantis is scheduled to lift off at 11:41 a.m. EDT today from Launch Pad 39B. During the STS-115 mission, Atlantis' astronauts will deliver and install the 17.5-ton, bus-sized P3/P4 integrated truss segment on the station. The girder-like truss includes a set of giant solar arrays, batteries and associated electronics and will provide one-fourth of the total power-generation capability for the completed station. This mission is the 116th space shuttle flight, the 27th flight for orbiter Atlantis, and the 19th U.S. flight to the ISS. STS-115 is scheduled to last 11 days with a planned landing at KSC. Photo credit: NASA/Kim Shiflett

KENNEDY SPACE CENTER, FLA. - After their return from space, the STS-115 crew members are welcomed by NASA and KSC officials. The crew, from left, are Mission Specialists Joseph Tanner, Heidemarie Stefanyshyn-Piper and Daniel Burbank; Pilot Christopher Ferguson; and Mission Specialist Steven MacLean. On the right are At right are NASA Administrator Michael Griffin, Deputy Associate Administrator for Space Operations Lynn Cline, a representative of the Canadian Space Agency, KSC Director Jim Kennedy and Deputy Director Bill Parsons. During the mission, astronauts completed three spacewalks to attach the P3/P4 integrated truss structure to the International Space Station. Main gear touchdown was at 6:21:30 a.m. EDT. Nose gear touchdown was at 6:21:36 a.m. and wheel stop was at 6:22:16 a.m. At touchdown -- nominally about 2,500 ft. beyond the runway threshold -- the orbiter is traveling at a speed ranging from 213 to 226 mph. Atlantis traveled 4.9 million miles, landing on orbit 187. Mission elapsed time was 11 days, 19 hours, six minutes. This is the 15th night landing at KSC and the 23rd night landing overall. Photo credit: NASA/Kim Shiflett

KENNEDY SPACE CENTER, FLA. - After suiting up, the STS-115 mission crew exits the Operations and Checkout Building to board the Astrovan to Launch Pad 39B. On the left, front to back, are Pilot Christopher Ferguson and Mission Specialists Steven MacLean and Heidemarie Stefanyshyn-Piper. On the right, front to back, are Commander Brent Jett and Mission Specialists Daniel Burbank and Joseph Tanner. The launch attempt on Sept. 8 was scrubbed due to an issue with a fuel cut-off sensor system inside the external fuel tank. This is one of several systems that protect the shuttle's main engines by triggering their shutdown if fuel runs unexpectedly low. During the STS-115 mission, Atlantis' astronauts will deliver and install the 17.5-ton, bus-sized P3/P4 integrated truss segment on the station. The girder-like truss includes a set of giant solar arrays, batteries and associated electronics and will provide one-fourth of the total power-generation capability for the completed station. This mission is the 116th space shuttle flight, the 27th flight for orbiter Atlantis, and the 19th U.S. flight to the ISS. STS-115 is scheduled to last 11 days with a planned landing at KSC. Photo credit: NASA/Kim Shiflett

Members of the U.S. World Cup Soccer Team pose with Astronauts Scott Parazynski, Heidemarie M. Stefanyshyn-Piper, Steven W. Lindsey, and Nancy Jane Currie and NASA Administrator Daniel Goldin after the team's arrival at the Skid Strip at Cape Canaveral Air Station. The team arrived with First Lady Hillary Rodham Clinton to view the launch of Space Shuttle mission STS-93. Liftoff is scheduled for 12:36 a.m. EDT July 20. Much attention has been generated over the launch due to Commander Eileen M. Collins, the first woman to serve as commander of a Shuttle mission. The primary payload of the five-day mission is the Chandra X-ray Observatory, which will allow scientists from around the world to study some of the most distant, powerful and dynamic objects in the universe. The new telescope is 20 to 50 times more sensitive than any previous X-ray telescope and is expected to unlock the secrets of supernovae, quasars and black holes

KENNEDY SPACE CENTER, FLA. - The STS-115 crew members walk toward the Astrovan that will take them to Launch Pad 39B. Seen left to right are Mission Specialists Heidemarie Stefanyshyn-Piper, Steven MacLean, Joseph Tanner and Daniel Burbank; Pilot Christopher Ferguson; and Commander Brent Jett. This is the second attempt at launch after a week's postponement due to weather and technical concerns. Atlantis is scheduled to lift off at 11:41 a.m. EDT on this date from Launch Pad 39B. During the STS-115 mission, Atlantis' astronauts will deliver and install the 17.5-ton, bus-sized P3/P4 integrated truss segment on the station. The girder-like truss includes a set of giant solar arrays, batteries and associated electronics and will provide one-fourth of the total power-generation capability for the completed station. This mission is the 116th space shuttle flight, the 27th flight for orbiter Atlantis, and the 19th U.S. flight to the ISS. STS-115 is scheduled to last 11 days with a planned landing at KSC. Photo credit: NASA/Kim Shiflett

KENNEDY SPACE CENTER, FLA. - The crew of mission STS-115 stop to talk to the media after arriving at NASA Kennedy Space Center's Shuttle Landing Facility to prepare for a second launch attempt on Sept. 6 to the International Space Station. Seen here, left to right, are Mission Specialists Steven MacLean and Joseph Tanner, Commander Brent Jett, Pilot Christopher Ferguson, and Mission Specialists Heidemarie Stefanyshyn-Piper and Daniel Burbank. Mission managers cancelled Atlantis' first launch campaign due to a lightning strike at the pad and the passage of Tropical Storm Ernesto along Florida's east coast. The mission will deliver and install the 17-and-a-half-ton P3/P4 truss segment to the port side of the integrated truss system on the orbital outpost. The truss includes a new set of photovoltaic solar arrays. When unfurled to their full length of 240 feet, the arrays will provide additional power for the station in preparation for the delivery of international science modules over the next two years. STS-115 is expected to last 11 days and includes three scheduled spacewalks. Photo credit: NASA/Kim Shiflett

KENNEDY SPACE CENTER, FLA. - After suiting up, the STS-115 mission crew enthusiastically greet the onlookers as they head to the Astrovan for the ride to Launch Pad 39B. From left are Mission Specialist Heidemarie Stefanyshyn-Piper, Steven MacLean, Joseph Tanner, Pilot Christopher Ferguson and Daniel Burbank. Not seen is Commander Brent Jett. The crew is eager for another attempt at liftoff after the Sept. 8 scrub. The launch attempt on Sept. 8 was scrubbed due to an issue with a fuel cut-off sensor system inside the external fuel tank. This is one of several systems that protect the shuttle's main engines by triggering their shutdown if fuel runs unexpectedly low. During the STS-115 mission, Atlantis' astronauts will deliver and install the 17.5-ton, bus-sized P3/P4 integrated truss segment on the station. The girder-like truss includes a set of giant solar arrays, batteries and associated electronics and will provide one-fourth of the total power-generation capability for the completed station. This mission is the 116th space shuttle flight, the 27th flight for orbiter Atlantis, and the 19th U.S. flight to the ISS. STS-115 is scheduled to last 11 days with a planned landing at KSC. Photo credit: NASA/Kim Shiflett