CAPE CANAVERAL, Fla. -- Positioned on a platform inside Orbiter Processing Facility-2 at NASA's Kennedy Space Center in Florida, members of the news media photograph space shuttle Endeavour's open payload bay. Ongoing transition and retirement activities are preparing the spacecraft for public display at the California Science Center in Los Angeles. Endeavour flew 25 missions during its 19-year career. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. -- Inside the cramped confines of space shuttle Endeavour's crew module, photographers document the appearance of the flight deck during a media event at NASA's Kennedy Space Center in Florida. Ongoing transition and retirement activities are preparing the spacecraft for public display at the California Science Center in Los Angeles. Endeavour flew 25 missions during its 19-year career. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. -- Members of the news media peer down into space shuttle Endeavour's open payload bay inside Orbiter Processing Facility-2 at NASA's Kennedy Space Center in Florida. Ongoing transition and retirement activities are preparing the spacecraft for public display at the California Science Center in Los Angeles. Endeavour flew 25 missions during its 19-year career. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. -- Standing beneath the midbody of space shuttle Endeavour, members of the news media interview Stephanie Stilson, NASA flow director for the shuttles' transition and retirement, inside Orbiter Processing Facility-2 at NASA's Kennedy Space Center in Florida. Stilson was one of several shuttle experts available for interviews around the outside of Endeavour and inside the shuttle's crew compartment. Ongoing transition and retirement activities are preparing the spacecraft for public display at the California Science Center in Los Angeles. Endeavour flew 25 missions during its 19-year career. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. -- Members of the news media interview Walter "Buddy" McKenzie, right, manager of technical operations with United Space Alliance, in front of space shuttle Endeavour's aft engine compartment inside Orbiter Processing Facility-2 at NASA's Kennedy Space Center in Florida. McKenzie was one of several shuttle experts available for interviews around the outside of Endeavour and inside the shuttle's crew compartment. Ongoing transition and retirement activities are preparing the spacecraft for public display at the California Science Center in Los Angeles. Endeavour flew 25 missions during its 19-year career. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. -- Standing beneath the midbody of space shuttle Endeavour, members of the news media interview Stephanie Stilson, NASA flow director for the shuttles' transition and retirement, inside Orbiter Processing Facility-2 at NASA's Kennedy Space Center in Florida. Stilson was one of several shuttle experts available for interviews around the outside of Endeavour and inside the shuttle's crew compartment. Ongoing transition and retirement activities are preparing the spacecraft for public display at the California Science Center in Los Angeles. Endeavour flew 25 missions during its 19-year career. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. -- Walter "Buddy" McKenzie, manager of technical operations with United Space Alliance, gestures toward space shuttle Endeavour's aft engine compartment during a media interview inside Orbiter Processing Facility-2 at NASA's Kennedy Space Center in Florida. McKenzie was one of several shuttle experts available for interviews around the outside of Endeavour and inside the shuttle's crew compartment. Ongoing transition and retirement activities are preparing the spacecraft for public display at the California Science Center in Los Angeles. Endeavour flew 25 missions during its 19-year career. Photo credit: NASA/Kim Shiflett

KENNEDY SPACE CENTER, FLA. -- Following the successful launch of Space Shuttle Endeavour on mission STS-111 today, NASA Administrator Sean O'Keefe (right) talks to the media in a briefing in the NASA/KSC television studio.

CAPE CANAVERAL, Fla. – STS-127 Pilot Doug Hurley answers a question from the media during a session with the media at NASA Kennedy Space Center's Launch Pad 39A. The crew is at Kennedy for a launch dress rehearsal called the terminal countdown demonstration test, or TCDT, which includes emergency egress training and equipment familiarization. Space shuttle Endeavour's STS-127 mission is the final of three flights dedicated to the assembly of the Japanese Kibo laboratory complex on the International Space Station. Endeavour's launch is targeted for June 13. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. - Jeff Moultrie, pilot of the Shuttle Carrier Aircraft, or SCA, speaks with news media at the Shuttle Landing Facility at NASA's Kennedy Space Center in Florida. The SCA will take space shuttle Endeavour from Florida to Los Angeles for public display. Photo credit: NASA/Kim Shiflett

KENNEDY SPACE CENTER, FLA. -- Following the successful launch of Space Shuttle Endeavour on mission STS-111 today, NASA Administrator Sean O'Keefe (right) talks to the media in a briefing in the NASA/KSC television studio. At left is Kyle Herring, public affairs office, Johnson Space Center, who moderated.

KENNEDY SPACE CENTER, FLA. -- Following the successful launch of Space Shuttle Endeavour on mission STS-111 today, NASA Administrator Sean O'Keefe (right) talks to the media in a briefing in the NASA/KSC television studio. At left is Kyle Herring, public affairs office, Johnson Space Center, who moderated.

CAPE CANAVERAL, Fla. - Henry Taylor, chief flight engineer on the Shuttle Carrier Aircraft, or SCA, speaks with news media at the Shuttle Landing Facility at NASA's Kennedy Space Center in Florida. The SCA will take space shuttle Endeavour from Florida to Los Angeles for public display. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. - Henry Taylor, chief flight engineer on the Shuttle Carrier Aircraft, or SCA, speaks with news media at the Shuttle Landing Facility at NASA's Kennedy Space Center in Florida. The SCA will take space shuttle Endeavour from Florida to Los Angeles for public display. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. --- Kaoru Mamiya, Japan Aerospace Exploration Agency vice president, answers a question during a media briefing held after the successful landing of space shuttle Endeavour to conclude the STS-123 mission. Endeavour landed on the second opportunity, on orbit 250, at 8:39:08 p.m. EDT. The STS-123 mission delivered the first segment of the Japan Aerospace Exploration Agency's Kibo laboratory and the Canadian Space Agency's two-armed robotic system, known as Dextre. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. --- Mike Leinbach, NASA space shuttle launch director, answers a question during a media briefing held after the successful landing of space shuttle Endeavour to conclude the STS-123 mission. Endeavour landed on the second opportunity, on orbit 250, at 8:39:08 p.m. EDT. The STS-123 mission delivered the first segment of the Japan Aerospace Exploration Agency's Kibo laboratory and the Canadian Space Agency's two-armed robotic system, known as Dextre. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. --- Michael Griffin, NASA administrator, answers a question during a media briefing held after the successful landing of space shuttle Endeavour to conclude the STS-123 mission. Endeavour landed on the second opportunity, on orbit 250, at 8:39:08 p.m. EDT. The STS-123 mission delivered the first segment of the Japan Aerospace Exploration Agency's Kibo laboratory and the Canadian Space Agency's two-armed robotic system, known as Dextre. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. – At NASA's Kennedy Space Center in Florida, media representatives photograph space shuttle Endeavour, secured atop NASA's Shuttle Carrier Aircraft or SCA, at the mate-demate device at the Shuttle Landing Facility. The SCA, a modified 747 jetliner, will fly Endeavour to Los Angeles where it will be placed on public display at the California Science Center. This is the final ferry flight scheduled in the Space Shuttle Program era. For more information on the shuttles' transition and retirement, visit http://www.nasa.gov/transition. Photo credit: NASA/Charisse Nahser

CAPE CANAVERAL, Fla. – Media representatives are given the opportunity to photograph space shuttle Endeavour, secured atop NASA's Shuttle Carrier Aircraft or SCA, at the Shuttle Landing Facility at NASA's Kennedy Space Center in Florida. Preparations are under way for Endeavour's upcoming ferry flight. The SCA, a modified 747 jetliner, will fly Endeavour to Los Angeles where it will be placed on public display at the California Science Center. This is the final ferry flight scheduled in the Space Shuttle Program era. For more information on the shuttles' transition and retirement, visit http://www.nasa.gov/transition. Photo credit: NASA/Charisse Nahser

CAPE CANAVERAL, Fla. -- During the L-1 prelaunch news briefing in the Press Site auditorium at NASA's Kennedy Space Center in Florida, STS-134 Payload Mission Manager Joe Delai speaks to media about the processing and readiness of space shuttle Endeavour's payload for flight. Endeavour and its crew will deliver the Express Logistics Carrier-3, Alpha Magnetic Spectrometer-2 (AMS), a high-pressure gas tank and additional spare parts for the Dextre robotic helper to the International Space Station. Launch is scheduled for April 29 at 3:47 p.m. EDT. This will be the final spaceflight for Endeavour. For more information visit, www.nasa.gov_mission_pages_shuttle_shuttlemissions_sts134_index.html. Photo credit: NASA_Jack Pfaller

CAPE CANAVERAL, Fla. -- In the Press Site auditorium at NASA's Kennedy Space Center in Florida, NASA Test Director Jeff Spaulding speaks to media about preparations for space shuttle Endeavour's launch on the STS-134 mission. Endeavour and its crew will deliver the Express Logistics Carrier-3, Alpha Magnetic Spectrometer-2 (AMS), a high-pressure gas tank and additional spare parts for the Dextre robotic helper to the International Space Station. Launch is scheduled for April 29 at 3:47 p.m. EDT. This will be the final spaceflight for Endeavour. For more information visit, www.nasa.gov_mission_pages_shuttle_shuttlemissions_sts134_index.html. Photo credit: NASA_Jack Pfaller

CAPE CANAVERAL, Fla. -- In the Press Site auditorium at NASA's Kennedy Space Center in Florida, Shuttle Weather Officer Kathy Winters speaks to media about the launch-day weather for space shuttle Endeavour's STS-134 mission. Endeavour and its crew will deliver the Express Logistics Carrier-3, Alpha Magnetic Spectrometer-2 (AMS), a high-pressure gas tank and additional spare parts for the Dextre robotic helper to the International Space Station. Launch is scheduled for April 29 at 3:47 p.m. EDT. This will be the final spaceflight for Endeavour. For more information visit, www.nasa.gov_mission_pages_shuttle_shuttlemissions_sts134_index.html. Photo credit: NASA_Jack Pfaller

CAPE CANAVERAL, Fla. -- STS-134 Payloads Mission Manager Joe Delai talks to media with space shuttle Endeavour and its primary payload in the background on Launch Pad 39A at NASA's Kennedy Space Center in Florida. The Alpha Magnetic Spectrometer-2 (AMS) and Express Logistics Carrier-3 are scheduled to be installed into the shuttle's cargo bay March 25. Endeavour and its six-member STS-134 crew are targeted to lift off April 19 at 7:48 p.m. EDT to deliver the payload to the International Space Station. This is Endeavour's final scheduled mission. For more information visit, www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts134/index.html. Photo credit: NASA/Frankie Martin

CAPE CANAVERAL, Fla. – At a post-landing news conference at NASA's Kennedy Space Center in Florida, President of the Japan Aerospace Exploration Agency Keiji Tachikawa (right) responds to a question from the media. Next to him at left is NASA Associate Administrator for Space Operations William Gerstenmaier. Space shuttle Endeavour and crew returned to Earth at 10:48 a.m. EDT to conclude the STS-127 mission. Endeavour delivered the Japanese Experiment Module's Exposed Facility and the Experiment Logistics Module-Exposed Section to the International Space Station. The mission was the 29th flight to the station, the 23rd flight of Endeavour and the 127th in the Space Shuttle Program, as well as the 71st landing at Kennedy. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. -- Media photographed the STS-134 crew as it arrived in a Shuttle Training Aircraft at NASA Kennedy Space Center's Shuttle Landing Facility in Florida. The astronauts are at Kennedy for final preparations for Endeavour's liftoff to the International Space Station scheduled for Monday, May 16 at 8:56 a.m. EDT. Endeavour and its crew will deliver the Express Logistics Carrier-3, Alpha Magnetic Spectrometer-2 (AMS), a high-pressure gas tank and additional spare parts for the Dextre robotic helper to the station. This will be the final spaceflight for Endeavour. For more information visit, www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts134/index.html. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. -- In the Press Site auditorium at NASA's Kennedy Space Center in Florida, staff for U.S. Congresswoman Gabielle Giffords brief media after the successful launch of space shuttle Endeavour on its STS-134 mission. From left are, Pia Carusone Chief of Staff, U.S. Rep. Gabrielle Giffords Office, Mark Kimble Press Advisor, U.S. Rep. Gabrielle Giffords Office and Ashley Nash-Hahn, New Media Strategist, U.S. Rep. Gabrielle Giffords Office. Giffords was on hand to watch her husband, STS-135 Commander Mark Kelly and his crew liftoff from Launch Pad 39A on Endeavour's final spaceflight. Endeavour lifted off May 16 at 8:56 a.m. EDT. Endeavour and its crew will deliver the Express Logistics Carrier-3, Alpha Magnetic Spectrometer-2 (AMS), a high-pressure gas tank and additional spare parts for the Dextre robotic helper to the station. For more information visit, www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts134/index.html. Photo credit: NASA/Jim Grossmann

CAPE CANAVERAL, Fla. – At NASA's Kennedy Space Center in Florida, Japan Aerospace Exploration Agency astronaut Koichi Wakata, responds to a question from the media at a news conference following the landing of space shuttle Endeavour. Wakata spent four months on the International Space Station and returned to Earth on Endeavour with the STS-127 crew. The landing completed the 16-day, 6.5-million mile journey on the STS-127 mission. Endeavour delivered the Japanese Experiment Module's Exposed Facility and the Experiment Logistics Module-Exposed Section to the International Space Station. The mission was the 29th flight to the station, the 23rd flight of Endeavour and the 127th in the Space Shuttle Program, as well as the 71st landing at Kennedy. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. -- Members of the media snap photos as a large yellow, metal sling lifts shuttle Endeavour from the transfer aisle into a high bay of the Vehicle Assembly Building at NASA's Kennedy Space Center in Florida. In the bay, the shuttle will be attached to its external fuel tank and solid rocket boosters. Endeavour is targeted to roll out to Kennedy's Launch Pad 39A for its final mission, STS-134, on March 9. Endeavour and the six-member crew will deliver the Express Logistics Carrier-3, Alpha Magnetic Spectrometer-2 (AMS), a high-pressure gas tank, additional spare parts for the Dextre robotic helper and micrometeoroid debris shields to the International Space Station. Endeavour's final launch is targeted for April 19 at 7:48 p.m. EDT. For more information visit, http://www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts134/index.html. Photo credit: NASA/Frankie Martin

CAPE CANAVERAL, Fla. -- At NASA's Kennedy Space Center in Florida, space shuttle Discovery rolls out of the Vehicle Assembly Building (VAB) past employees and media representatives on its way to rendezvous with shuttle Endeavour. Discovery is switching places with Endeavour which has been undergoing decommissioning in Orbiter Processing Facility-1 (OPF-1). Both shuttles will stop briefly outside OPF-3 for a "nose-to-nose" photo opportunity. Discovery then will be rolled into OPF-1 and Endeavour into the VAB. The image was taken from the top of the VAB. In OPF-1, Discovery will undergo further preparations for public display at the Smithsonian's National Air and Space Museum Steven F. Udvar-Hazy Center in Virginia. Endeavour will be stored in the VAB until October when it will be moved into OPF-2 for further work to get it ready for public display at the California Science Center in Los Angeles. For more information, visit http://www.nasa.gov/shuttle. Photo credit: NASA/Frankie Martin

CAPE CANAVERAL, Fla. -- In the Press Site auditorium at NASA's Kennedy Space Center in Florida, NASA managers brief media about their unanimous approval to proceed with space shuttle Endeavour's STS-134 mission. From left are Shuttle Weather Officer Kathy Winters, Shuttle Launch Director Mike Leinbach and Space Shuttle Program Launch Integration Manager Mike Moses. Endeavour's launch is scheduled for May 16 at 8:56 a.m. EDT. Endeavour and its crew will deliver the Express Logistics Carrier-3, Alpha Magnetic Spectrometer-2 (AMS), a high-pressure gas tank and additional spare parts for the Dextre robotic helper to the station. This will be the final spaceflight for Endeavour. For more information visit, www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts134/index.html. Photo credit: NASA/Ben Smegelsky

CAPE CANAVERAL, Fla. -- In the Press Site auditorium at NASA's Kennedy Space Center in Florida, NASA managers brief media about their unanimous approval to proceed with space shuttle Endeavour's STS-134 mission. From left, are NASA Public Affairs Officer Candrea Thomas, Space Shuttle Program Launch Integration Manager Mike Moses, Shuttle Launch Director Mike Leinbach and Shuttle Weather Officer Kathy Winters. Endeavour's launch is scheduled for May 16 at 8:56 a.m. EDT. Endeavour and its crew will deliver the Express Logistics Carrier-3, Alpha Magnetic Spectrometer-2 (AMS), a high-pressure gas tank and additional spare parts for the Dextre robotic helper to the station. This will be the final spaceflight for Endeavour. For more information visit, www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts134/index.html. Photo credit: NASA/Ben Smegelsky

CAPE CANAVERAL, Fla. -- Media snap photos and record the arrival of space shuttle Endeavour's STS-134 crew members on the Shuttle Landing Facility at NASA's Kennedy Space Center in Florida. While at Kennedy, Endeavour's crew will participate in a launch countdown dress rehearsal called the Terminal Countdown Demonstration Test (TCDT) and related training in preparation for the upcoming STS-134 mission. Endeavour and its six STS-134 crew members will deliver the Express Logistics Carrier-3, Alpha Magnetic Spectrometer-2 (AMS), a high-pressure gas tank, additional spare parts for the Dextre robotic helper and micrometeoroid debris shields to the International Space Station. This will be the final spaceflight for Endeavour. Launch is targeted for April 19 at 7:48 p.m. EDT. For more information visit, www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts134/index.html. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. -- At NASA's Kennedy Space Center in Florida, employees and media representatives set up their cameras to capture space shuttles Discovery, at left, and Endeavour outside Orbiter Processing Facility-3 (OPF-3) during a unique "nose-to-nose" photo opportunity. Discovery, which temporarily was being stored in the Vehicle Assembly Building (VAB), is switching places with Endeavour, which has been undergoing decommissioning in OPF-1. Discovery then will be rolled into OPF-1 and Endeavour into the VAB. In OPF-1, Discovery will undergo further preparations for public display at the Smithsonian's National Air and Space Museum Steven F. Udvar-Hazy Center in Virginia. Endeavour will be stored in the VAB until October when it will be moved into OPF-2 for further work to get it ready for public display at the California Science Center in Los Angeles. For more information, visit http://www.nasa.gov/shuttle. Photo credit: NASA/Jim Grossmann

CAPE CANAVERAL, Fla. -- In the Press Site auditorium at NASA's Kennedy Space Center in Florida, NASA managers brief media after the successful launch of space shuttle Endeavour on its STS-134 mission. From left are, Associate Administrator for Space Operations Bill Gerstenmaier; Michel Tognini, head of the European Astronaut Center and former ESA astronaut; Space Shuttle Program Launch Integration Manager Mike Moses; and Shuttle Launch Director Mike Leinbach. Endeavour lifted off May 16 at 8:56 a.m. EDT. Endeavour and its crew will deliver the Express Logistics Carrier-3, Alpha Magnetic Spectrometer-2 (AMS), a high-pressure gas tank and additional spare parts for the Dextre robotic helper to the station. This is the final spaceflight for Endeavour. For more information visit, www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts134/index.html. Photo credit: NASA/Jim Grossmann

CAPE CANAVERAL, Fla. -- Members of the media snap photos as a large yellow, metal sling lifts shuttle Endeavour from the transfer aisle into a high bay of the Vehicle Assembly Building at NASA's Kennedy Space Center in Florida. In the bay, the shuttle will be attached to its external fuel tank and solid rocket boosters. Endeavour is targeted to roll out to Kennedy's Launch Pad 39A for its final mission, STS-134, on March 9. Endeavour and the six-member crew will deliver the Express Logistics Carrier-3, Alpha Magnetic Spectrometer-2 (AMS), a high-pressure gas tank, additional spare parts for the Dextre robotic helper and micrometeoroid debris shields to the International Space Station. Endeavour's final launch is targeted for April 19 at 7:48 p.m. EDT. For more information visit, http://www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts134/index.html. Photo credit: NASA/Frankie Martin

CAPE CANAVERAL, Fla. -- In the Press Site auditorium at NASA's Kennedy Space Center in Florida, NASA managers brief media about their unanimous approval to proceed with space shuttle Endeavour's STS-134 mission. From left, are NASA Public Affairs Officer Candrea Thomas, Space Shuttle Program Launch Integration Manager Mike Moses, Shuttle Launch Director Mike Leinbach and Shuttle Weather Officer Kathy Winters. Endeavour's launch is scheduled for May 16 at 8:56 a.m. EDT. Endeavour and its crew will deliver the Express Logistics Carrier-3, Alpha Magnetic Spectrometer-2 (AMS), a high-pressure gas tank and additional spare parts for the Dextre robotic helper to the station. This will be the final spaceflight for Endeavour. For more information visit, www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts134/index.html. Photo credit: NASA/Ben Smegelsky

CAPE CANAVERAL, Fla. – Space shuttle Endeavour's STS-127 mission crew members greet the media after arriving at NASA's Kennedy Space Center in Florida for the Terminal Countdown Demonstration Test, or TCDT. Seen here is Mission Specialist Julie Payette, who represents the Canadian Space Agency. The astronauts will be taking part in Terminal Countdown Demonstration Test activities that include equipment familiarization and emergency egress training, and culminates in a simulated launch countdown aboard Endeavour. The STS-127 mission is the final of three flights dedicated to the assembly of the Japanese Kibo laboratory complex. Launch is targeted for June 13. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. – NASA astronaut Kay Hire is interviewed by members of the news media at the Shuttle Landing Facility at NASA's Kennedy Space Center in Florida. Hire was on hand to discuss the space shuttle Endeavour's trip to California mounted atop NASA's Shuttle Carrier Aircraft, or SCA. The SCA, a modified 747 jetliner, will fly Endeavour to Los Angeles where it will be placed on public display at the California Science Center. This is the final ferry flight scheduled in the Space Shuttle Program era. For more information on the shuttles' transition and retirement, visit http://www.nasa.gov/transition. Photo credit: NASA/ Tim Jacobs

CAPE CANAVERAL, Fla. – At the Shuttle Landing Facility at NASA's Kennedy Space Center in Florida, members of the news media photograph the space shuttle Endeavour, mounted atop NASA's Shuttle Carrier Aircraft, or SCA, as it is prepared for roll back from the mate-demate device. The SCA, a modified 747 jetliner, will fly Endeavour to Los Angeles where it will be placed on public display at the California Science Center. This is the final ferry flight scheduled in the Space Shuttle Program era. For more information on the shuttles' transition and retirement, visit http://www.nasa.gov/transition. Photo credit: NASA/ Tim Jacobs

CAPE CANAVERAL, Fla. -- At the Shuttle Landing Facility at NASA's Kennedy Space Center in Florida, space shuttle Endeavour's STS-134 Commander Mark Kelly speaks to the media before the arrival of the Alpha Magnetic Spectrometer, or AMS. AMS, a state-of-the-art particle physics detector, is designed to operate as an external module on the International Space Station. It will use the unique environment of space to study the universe and its origin by searching for dark matter. AMS will fly to the International Space Station aboard space shuttle Endeavour's STS-134 mission targeted to launch Feb. 26, 2011. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. – Space shuttle Endeavour's STS-127 mission crew members greet the media after arriving at NASA's Kennedy Space Center in Florida for the Terminal Countdown Demonstration Test, or TCDT. Seen here is Mission Specialist Tim Kopra. The astronauts will be taking part in Terminal Countdown Demonstration Test activities that include equipment familiarization and emergency egress training, and culminates in a simulated launch countdown aboard Endeavour. The STS-127 mission is the final of three flights dedicated to the assembly of the Japanese Kibo laboratory complex. Launch is targeted for June 13. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. – Space shuttle Endeavour's STS-127 mission crew members greet the media after arriving at NASA's Kennedy Space Center in Florida for the Terminal Countdown Demonstration Test, or TCDT. Seen here is Mission Specialist Chris Cassidy. The astronauts will be taking part in Terminal Countdown Demonstration Test activities that include equipment familiarization and emergency egress training, and culminates in a simulated launch countdown aboard Endeavour. The STS-127 mission is the final of three flights dedicated to the assembly of the Japanese Kibo laboratory complex. Launch is targeted for June 13. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. – Media representatives are given the opportunity to photograph and interview astronaut Kay Hire, in the blue flight suit, at the Shuttle Landing Facility at NASA's Kennedy Space Center in Florida. Preparations are under way for space shuttle Endeavour's upcoming ferry flight atop NASA's Shuttle Carrier Aircraft, or SCA. The SCA, a modified 747 jetliner, will fly Endeavour to Los Angeles where it will be placed on public display at the California Science Center. This is the final ferry flight scheduled in the Space Shuttle Program era. For more information on the shuttles' transition and retirement, visit http://www.nasa.gov/transition. Photo credit: NASA/Charisse Nahser

CAPE CANAVERAL, Fla. – Space shuttle Endeavour's STS-127 mission crew members greet the media after arriving at NASA's Kennedy Space Center in Florida for the Terminal Countdown Demonstration Test, or TCDT. Seen here is Mission Specialist Tom Marshburn. The astronauts will be taking part in Terminal Countdown Demonstration Test activities that include equipment familiarization and emergency egress training, and culminates in a simulated launch countdown aboard Endeavour. The STS-127 mission is the final of three flights dedicated to the assembly of the Japanese Kibo laboratory complex. Launch is targeted for June 13. Photo credit: NASA/Kim Shiflett

KENNEDY SPACE CENTER, Fla. -- STS-89 Commander Terrence Wilcutt participates in a question and answer session for the media during Terminal Countdown Demonstration Test (TCDT) activities at KSC. The seven astronauts assigned to the eighth Shuttle-Mir docking flight are at KSC for this dress rehearsal for launch, which includes emergency egress training at the launch pad and culminates with a simulated countdown. The Space Shuttle Endeavour is undergoing preparations for liftoff, scheduled for Jan. 22. STS-89 Mission Specialist Andrew Thomas, Ph.D, will transfer to the Russian Space Station Mir, and succeed David Wolf, M.D., who will return to Earth aboard Endeavour. Dr. Thomas will live and work on Mir until June

CAPE CANAVERAL, Fla. -- The International Space Station Science and Technology Briefing was held in the Press Site auditorium at NASA's Kennedy Space Center in Florida. Speaking to media about the Alpha Magnetic Spectrometer-2 (AMS) is Professor Sam Ting, AMS-2 principal investigator at the Massachusetts Institute of Technology. Endeavour and its crew will deliver the Express Logistics Carrier-3, Alpha Magnetic Spectrometer-2 (AMS), a high-pressure gas tank and additional spare parts for the Dextre robotic helper to the International Space Station. Launch is scheduled for April 29 at 3:47 p.m. EDT. This will be the final spaceflight for Endeavour. For more information visit, www.nasa.gov_mission_pages_shuttle_shuttlemissions_sts134_index.html. Photo credit: NASA_Kim Shiflett

CAPE CANAVERAL, Fla. – A large crowd of news media and spectators were on hand near the control tower viewing area at the Shuttle Landing Facility at NASA's Kennedy Space Center in Florida to watch NASA's Shuttle Carrier Aircraft, or SCA, with the space shuttle Endeavour mounted atop, begin its ferry flight to California. The SCA, a modified 747 jetliner, will fly Endeavour to Los Angeles where it will be placed on public display at the California Science Center. This is the final ferry flight scheduled in the Space Shuttle Program era. For more information on the shuttles' transition and retirement, visit http://www.nasa.gov/transition. Photo credit: NASA/Frankie Martin

CAPE CANAVERAL, Fla. – STS-127 Mission Specialist Julie Payette answers a question during a session with the media at NASA Kennedy Space Center's Launch Pad 39A. Payette represents the Canadian Space Agency. The crew is at Kennedy for a launch dress rehearsal called the terminal countdown demonstration test, or TCDT, which includes emergency egress training and equipment familiarization. Space shuttle Endeavour's STS-127 mission is the final of three flights dedicated to the assembly of the Japanese Kibo laboratory complex on the International Space Station. Endeavour's launch is targeted for June 13. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. --- STS-123 Mission Specialist Mike Foreman talks to the media about his experiences on the mission to the International Space Station. The crew landed at Kennedy aboard space shuttle Endeavour at 8:39 p.m. EDT March 26. Endeavour's 16-day flight was the longest shuttle mission to the International Space Station and included a record five spacewalks. The shuttle's seven astronauts worked with the three-member station crew and ground teams around the world to install the first section of the Japan Aerospace Exploration Agency's Kibo laboratory and the Canadian Space Agency's two-armed robotic system, known as Dextre. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. – Media representatives turn out to interview astronaut Kay Hire at the Shuttle Landing Facility at NASA's Kennedy Space Center in Florida. Preparations are under way for space shuttle Endeavour's upcoming ferry flight atop NASA's Shuttle Carrier Aircraft, or SCA. The SCA, a modified 747 jetliner, will fly Endeavour to Los Angeles where it will be placed on public display at the California Science Center. This is the final ferry flight scheduled in the Space Shuttle Program era. For more information on the shuttles' transition and retirement, visit http://www.nasa.gov/transition. Photo credit: NASA/Dimitri Gerondidakis

CAPE CANAVERAL, Fla. – During a question-and-answer session with the media at NASA Kennedy Space Center's Launch Pad 39A, STS-127 Mission Specialists Christopher Cassidy (left) and Dave Wolf banter about their shared experiences. The crew is at Kennedy for a launch dress rehearsal called the terminal countdown demonstration test, or TCDT, which includes emergency egress training and equipment familiarization. Space shuttle Endeavour's STS-127 mission is the final of three flights dedicated to the assembly of the Japanese Kibo laboratory complex on the International Space Station. Endeavour's launch is targeted for June 13. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. – Space shuttle Endeavour's STS-127 mission crew members greet the media after arriving at NASA's Kennedy Space Center in Florida for the Terminal Countdown Demonstration Test, or TCDT. Seen here is Mission Specialist Dave Wolf. The astronauts will be taking part in Terminal Countdown Demonstration Test activities that include equipment familiarization and emergency egress training, and culminates in a simulated launch countdown aboard Endeavour. The STS-127 mission is the final of three flights dedicated to the assembly of the Japanese Kibo laboratory complex. Launch is targeted for June 13. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. – At the Shuttle Landing Facility at NASA's Kennedy Space Center in Florida, members of the news media photograph the space shuttle Endeavour, mounted atop NASA's Shuttle Carrier Aircraft, or SCA, as it prepares to roll back from the mate-demate device. The SCA, a modified 747 jetliner, will fly Endeavour to Los Angeles where it will be placed on public display at the California Science Center. This is the final ferry flight scheduled in the Space Shuttle Program era. For more information on the shuttles' transition and retirement, visit http://www.nasa.gov/transition. Photo credit: NASA/ Kim Shiflett

CAPE CANAVERAL, Fla. --- STS-123 Pilot Gregory H. Johnson talks to the media about his experiences on the mission to the International Space Station. The crew landed at Kennedy aboard space shuttle Endeavour at 8:39 p.m. EDT March 26. Endeavour's 16-day flight was the longest shuttle mission to the International Space Station and included a record five spacewalks. The shuttle's seven astronauts worked with the three-member station crew and ground teams around the world to install the first section of the Japan Aerospace Exploration Agency's Kibo laboratory and the Canadian Space Agency's two-armed robotic system, known as Dextre. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. -- The International Space Station Science and Technology Briefing was held in the Press Site auditorium at NASA's Kennedy Space Center in Florida. Speaking to media about the Alpha Magnetic Spectrometer-2 (AMS) is Saul Gonzales, AMS program manager from the U.S. Department of Energy. Endeavour and its crew will deliver the Express Logistics Carrier-3, Alpha Magnetic Spectrometer-2 (AMS), a high-pressure gas tank and additional spare parts for the Dextre robotic helper to the International Space Station. Launch is scheduled for April 29 at 3:47 p.m. EDT. This will be the final spaceflight for Endeavour. For more information visit, www.nasa.gov_mission_pages_shuttle_shuttlemissions_sts134_index.html. Photo credit: NASA_Kim Shiflett

CAPE CANAVERAL, Fla. – At the Shuttle Landing Facility at NASA's Kennedy Space Center in Florida, members of the news media photograph the space shuttle Endeavour, mounted atop NASA's Shuttle Carrier Aircraft, or SCA, as it rolls back from the mate-demate device. The SCA, a modified 747 jetliner, will fly Endeavour to Los Angeles where it will be placed on public display at the California Science Center. This is the final ferry flight scheduled in the Space Shuttle Program era. For more information on the shuttles' transition and retirement, visit http://www.nasa.gov/transition. Photo credit: NASA/ Tim Jacobs

CAPE CANAVERAL, Fla. – At the Shuttle Landing Facility at NASA's Kennedy Space Center in Florida, members of the news media photograph the space shuttle Endeavour, mounted atop NASA's Shuttle Carrier Aircraft, or SCA, as it is prepared for roll back from the mate-demate device. The SCA, a modified 747 jetliner, will fly Endeavour to Los Angeles where it will be placed on public display at the California Science Center. This is the final ferry flight scheduled in the Space Shuttle Program era. For more information on the shuttles' transition and retirement, visit http://www.nasa.gov/transition. Photo credit: NASA/ Tim Jacobs

CAPE CANAVERAL, Fla. – Members of the news media record the arrival of space shuttle Endeavour at the Shuttle Landing Facility after the shuttle was towed from the Vehicle Assembly Building at NASA's Kennedy Space Center in Florida. Endeavour was towed to the Mate-Demate Device, or MDD, where the shuttle will be lifted and connected to the top of NASA's Shuttle Carrier Aircraft SCA, a modified 747 jetliner. The shuttle has been fitted with an aerodynamic tailcone for its flight aboard the SCA to Los Angeles where it will be placed on public display. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. -- At NASA's Kennedy Space Center in Florida, media and the crew of space shuttle Endeavour's STS-134 mission gather on the Shuttle Landing Facility runway to check out the Alpha Magnetic Spectrometer, or AMS, which arrived aboard an Air Force C-5M aircraft from Europe. AMS, a state-of-the-art particle physics detector, is designed to operate as an external module on the International Space Station. It will use the unique environment of space to study the universe and its origin by searching for dark matter. AMS will fly to the International Space Station aboard space shuttle Endeavour's STS-134 mission, targeted to launch Feb. 26, 2011. Photo credit: NASA/Jack Pfaller

CAPE CANAVERAL, Fla. – STS-127 Mission Specialist Dave Wolf answers a question during a session with the media at NASA Kennedy Space Center's Launch Pad 39A. The crew is at Kennedy for a launch dress rehearsal called the terminal countdown demonstration test, or TCDT, which includes emergency egress training and equipment familiarization. Space shuttle Endeavour's STS-127 mission is the final of three flights dedicated to the assembly of the Japanese Kibo laboratory complex on the International Space Station. Endeavour's launch is targeted for June 13. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. --- STS-123 Commander Dominic Gorie talks to the media about his experiences on the mission to the International Space Station. The crew landed at Kennedy aboard space shuttle Endeavour at 8:39 p.m. EDT March 26. Endeavour's 16-day flight was the longest shuttle mission to the International Space Station and included a record five spacewalks. The shuttle's seven astronauts worked with the three-member station crew and ground teams around the world to install the first section of the Japan Aerospace Exploration Agency's Kibo laboratory and the Canadian Space Agency's two-armed robotic system, known as Dextre. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. --- After the successful landing of space shuttle Endeavour to conclude the STS-123 mission, NASA officials hold a media briefing. The participants are, left to right, LeRoy Cain, chair of the mission management team; and Mike Leinbach, NASA space shuttle launch director. Endeavour landed on the second opportunity, on orbit 250, at 8:39:08 p.m. EDT. The STS-123 mission delivered the first segment of the Japan Aerospace Exploration Agency's Kibo laboratory and the Canadian Space Agency's two-armed robotic system, known as Dextre. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. – Space shuttle Endeavour's STS-127 mission crew members greet the media after arriving at NASA's Kennedy Space Center in Florida for the Terminal Countdown Demonstration Test, or TCDT. Seen here is Pilot Doug Hurley. The astronauts will be taking part in Terminal Countdown Demonstration Test activities that include equipment familiarization and emergency egress training, and culminates in a simulated launch countdown aboard Endeavour. The STS-127 mission is the final of three flights dedicated to the assembly of the Japanese Kibo laboratory complex. Launch is targeted for June 13. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. --- STS-123 Pilot Gregory H. Johnson talks to the media about his experiences on the mission to the International Space Station. The crew landed at Kennedy aboard space shuttle Endeavour at 8:39 p.m. EDT March 26. Endeavour's 16-day flight was the longest shuttle mission to the International Space Station and included a record five spacewalks. The shuttle's seven astronauts worked with the three-member station crew and ground teams around the world to install the first section of the Japan Aerospace Exploration Agency's Kibo laboratory and the Canadian Space Agency's two-armed robotic system, known as Dextre. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. – At the Shuttle Landing Facility at NASA's Kennedy Space Center in Florida, members of the news media photograph the space shuttle Endeavour, mounted atop NASA's Shuttle Carrier Aircraft, or SCA, as it rolls back from the mate-demate device. The SCA, a modified 747 jetliner, will fly Endeavour to Los Angeles where it will be placed on public display at the California Science Center. This is the final ferry flight scheduled in the Space Shuttle Program era. For more information on the shuttles' transition and retirement, visit http://www.nasa.gov/transition. Photo credit: NASA/ Tim Jacobs

CAPE CANAVERAL, Fla. – Space shuttle Endeavour's STS-127 mission crew members greet the media after arriving at NASA's Kennedy Space Center in Florida. Seen here is Commander Mark Polansky, who explained they were at Kennedy for the Terminal Countdown Demonstration Test, or TCDT. The astronauts will be taking part in Terminal Countdown Demonstration Test activities that include equipment familiarization and emergency egress training, and culminates in a simulated launch countdown aboard Endeavour. The STS-127 mission is the final of three flights dedicated to the assembly of the Japanese Kibo laboratory complex. Launch is targeted for June 13. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. -- The STS-134 Pilot Greg H. Johnson participates in a media question-and-answer session in the Press Site TV auditorium at NASA's Kennedy Space Center in Florida. The crew was scheduled to answer questions at Launch Pad 39A, where space shuttle Endeavour is awaiting liftoff, but severe storms associated with a frontal system passing over Central Florida brought the media event indoors. Endeavour's six crew members are at Kennedy for the launch countdown dress rehearsal called the Terminal Countdown Demonstration Test (TCDT) and related training. Targeted to launch April 19 at 7:48 p.m. EDT, they will deliver the Express Logistics Carrier-3, Alpha Magnetic Spectrometer-2 (AMS), a high-pressure gas tank, additional spare parts for the Dextre robotic helper and micrometeoroid debris shields to the International Space Station. This is the final spaceflight for Endeavour. For more information visit, www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts134/index.html. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. -- The STS-134 Commander Mark Kelly participates in a media question-and-answer session in the Press Site TV auditorium at NASA's Kennedy Space Center in Florida. The crew was scheduled to answer questions at Launch Pad 39A, where space shuttle Endeavour is awaiting liftoff, but severe storms associated with a frontal system passing over Central Florida brought the media event indoors. Endeavour's six crew members are at Kennedy for the launch countdown dress rehearsal called the Terminal Countdown Demonstration Test (TCDT) and related training. Targeted to launch April 19 at 7:48 p.m. EDT, they will deliver the Express Logistics Carrier-3, Alpha Magnetic Spectrometer-2 (AMS), a high-pressure gas tank, additional spare parts for the Dextre robotic helper and micrometeoroid debris shields to the International Space Station. This is the final spaceflight for Endeavour. For more information visit, www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts134/index.html. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. -- The STS-134 Mission Specialist Greg Chamitoff participates in a media question-and-answer session in the Press Site TV auditorium at NASA's Kennedy Space Center in Florida. The crew was scheduled to answer questions at Launch Pad 39A, where space shuttle Endeavour is awaiting liftoff, but severe storms associated with a frontal system passing over Central Florida brought the media event indoors. Endeavour's six crew members are at Kennedy for the launch countdown dress rehearsal called the Terminal Countdown Demonstration Test (TCDT) and related training. Targeted to launch April 19 at 7:48 p.m. EDT, they will deliver the Express Logistics Carrier-3, Alpha Magnetic Spectrometer-2 (AMS), a high-pressure gas tank, additional spare parts for the Dextre robotic helper and micrometeoroid debris shields to the International Space Station. This is the final spaceflight for Endeavour. For more information visit, www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts134/index.html. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. -- The STS-134 crew answers media questions in the Press Site TV auditorium at NASA's Kennedy Space Center in Florida. From left, are Commander Mark Kelly, Pilot Greg H. Johnson, and Mission Specialists Michael Fincke, European Space Agency astronaut Roberto Vittori, Andrew Feustel, and Greg Chamitoff. The crew was scheduled to answer questions at Launch Pad 39A, where space shuttle Endeavour is awaiting liftoff, but severe storms associated with a frontal system passing over Central Florida brought the media event indoors. Endeavour's six crew members are at Kennedy for the launch countdown dress rehearsal called the Terminal Countdown Demonstration Test (TCDT) and related training. Targeted to launch April 19 at 7:48 p.m. EDT, they will deliver the Express Logistics Carrier-3, Alpha Magnetic Spectrometer-2 (AMS), a high-pressure gas tank, additional spare parts for the Dextre robotic helper and micrometeoroid debris shields to the International Space Station. This will be the final spaceflight for Endeavour. For more information visit, www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts134/index.html. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. -- The STS-134 crew answers media questions in the Press Site TV auditorium at NASA's Kennedy Space Center in Florida. From left, are Commander Mark Kelly, Pilot Greg H. Johnson, and Mission Specialists Michael Fincke, European Space Agency astronaut Roberto Vittori, Andrew Feustel, and Greg Chamitoff. The crew was scheduled to answer questions at Launch Pad 39A, where space shuttle Endeavour is awaiting liftoff, but severe storms associated with a frontal system passing over Central Florida brought the media event indoors. Endeavour's six crew members are at Kennedy for the launch countdown dress rehearsal called the Terminal Countdown Demonstration Test (TCDT) and related training. Targeted to launch April 19 at 7:48 p.m. EDT, they will deliver the Express Logistics Carrier-3, Alpha Magnetic Spectrometer-2 (AMS), a high-pressure gas tank, additional spare parts for the Dextre robotic helper and micrometeoroid debris shields to the International Space Station. This will be the final spaceflight for Endeavour. For more information visit, www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts134/index.html. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. -- The STS-134 Mission Specialist Roberto Vittori, with the European Space Agency, participates in a media question-and-answer session in the Press Site TV auditorium at NASA's Kennedy Space Center in Florida. The crew was scheduled to answer questions at Launch Pad 39A, where space shuttle Endeavour is awaiting liftoff, but severe storms associated with a frontal system passing over Central Florida brought the media event indoors. Endeavour's six crew members are at Kennedy for the launch countdown dress rehearsal called the Terminal Countdown Demonstration Test (TCDT) and related training. Targeted to launch April 19 at 7:48 p.m. EDT, they will deliver the Express Logistics Carrier-3, Alpha Magnetic Spectrometer-2 (AMS), a high-pressure gas tank, additional spare parts for the Dextre robotic helper and micrometeoroid debris shields to the International Space Station. This is the final spaceflight for Endeavour. For more information visit, www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts134/index.html. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. -- The STS-134 Commander Mark Kelly participates in a media question-and-answer session in the Press Site TV auditorium at NASA's Kennedy Space Center in Florida. The crew was scheduled to answer questions at Launch Pad 39A, where space shuttle Endeavour is awaiting liftoff, but severe storms associated with a frontal system passing over Central Florida brought the media event indoors. Endeavour's six crew members are at Kennedy for the launch countdown dress rehearsal called the Terminal Countdown Demonstration Test (TCDT) and related training. Targeted to launch April 19 at 7:48 p.m. EDT, they will deliver the Express Logistics Carrier-3, Alpha Magnetic Spectrometer-2 (AMS), a high-pressure gas tank, additional spare parts for the Dextre robotic helper and micrometeoroid debris shields to the International Space Station. This is the final spaceflight for Endeavour. For more information visit, www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts134/index.html. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. -- The STS-134 Mission Specialist Andrew Feustel participates in a media question-and-answer session in the Press Site TV auditorium at NASA's Kennedy Space Center in Florida. The crew was scheduled to answer questions at Launch Pad 39A, where space shuttle Endeavour is awaiting liftoff, but severe storms associated with a frontal system passing over Central Florida brought the media event indoors. Endeavour's six crew members are at Kennedy for the launch countdown dress rehearsal called the Terminal Countdown Demonstration Test (TCDT) and related training. Targeted to launch April 19 at 7:48 p.m. EDT, they will deliver the Express Logistics Carrier-3, Alpha Magnetic Spectrometer-2 (AMS), a high-pressure gas tank, additional spare parts for the Dextre robotic helper and micrometeoroid debris shields to the International Space Station. This is the final spaceflight for Endeavour. For more information visit, www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts134/index.html. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. -- The STS-134 crew answers media questions in the Press Site TV auditorium at NASA's Kennedy Space Center in Florida. From left, are Commander Mark Kelly, Pilot Greg H. Johnson, and Mission Specialists Michael Fincke, European Space Agency astronaut Roberto Vittori, Andrew Feustel, and Greg Chamitoff. The crew was scheduled to answer questions at Launch Pad 39A, where space shuttle Endeavour is awaiting liftoff, but severe storms associated with a frontal system passing over Central Florida brought the media event indoors. Endeavour's six crew members are at Kennedy for the launch countdown dress rehearsal called the Terminal Countdown Demonstration Test (TCDT) and related training. Targeted to launch April 19 at 7:48 p.m. EDT, they will deliver the Express Logistics Carrier-3, Alpha Magnetic Spectrometer-2 (AMS), a high-pressure gas tank, additional spare parts for the Dextre robotic helper and micrometeoroid debris shields to the International Space Station. This will be the final spaceflight for Endeavour. For more information visit, www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts134/index.html. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. -- The STS-134 Mission Specialist Michael Fincke participates in a media question-and-answer session in the Press Site TV auditorium at NASA's Kennedy Space Center in Florida. The crew was scheduled to answer questions at Launch Pad 39A, where space shuttle Endeavour is awaiting liftoff, but severe storms associated with a frontal system passing over Central Florida brought the media event indoors. Endeavour's six crew members are at Kennedy for the launch countdown dress rehearsal called the Terminal Countdown Demonstration Test (TCDT) and related training. Targeted to launch April 19 at 7:48 p.m. EDT, they will deliver the Express Logistics Carrier-3, Alpha Magnetic Spectrometer-2 (AMS), a high-pressure gas tank, additional spare parts for the Dextre robotic helper and micrometeoroid debris shields to the International Space Station. This is the final spaceflight for Endeavour. For more information visit, www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts134/index.html. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. -- The STS-134 Commander Mark Kelly and Pilot Greg H. Johnson participate in a media question-and-answer session in the Press Site TV auditorium at NASA's Kennedy Space Center in Florida. The crew was scheduled to answer questions at Launch Pad 39A, where space shuttle Endeavour is awaiting liftoff, but severe storms associated with a frontal system passing over Central Florida brought the media event indoors. Endeavour's six crew members are at Kennedy for the launch countdown dress rehearsal called the Terminal Countdown Demonstration Test (TCDT) and related training. Targeted to launch April 19 at 7:48 p.m. EDT, they will deliver the Express Logistics Carrier-3, Alpha Magnetic Spectrometer-2 (AMS), a high-pressure gas tank, additional spare parts for the Dextre robotic helper and micrometeoroid debris shields to the International Space Station. This is the final spaceflight for Endeavour. For more information visit, www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts134/index.html. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. -- The STS-134 crew answers media questions in the Press Site TV auditorium at NASA's Kennedy Space Center in Florida. From left, are Kennedy's News Chief Allard Beutel, Commander Mark Kelly, Pilot Greg H. Johnson, and Mission Specialists Michael Fincke, European Space Agency astronaut Roberto Vittori, Andrew Feustel, and Greg Chamitoff. The crew was scheduled to answer questions at Launch Pad 39A, where space shuttle Endeavour is awaiting liftoff, but severe storms associated with a frontal system passing over Central Florida brought the media event indoors. Endeavour's six crew members are at Kennedy for the launch countdown dress rehearsal called the Terminal Countdown Demonstration Test (TCDT) and related training. Targeted to launch April 19 at 7:48 p.m. EDT, they will deliver the Express Logistics Carrier-3, Alpha Magnetic Spectrometer-2 (AMS), a high-pressure gas tank, additional spare parts for the Dextre robotic helper and micrometeoroid debris shields to the International Space Station. This will be the final spaceflight for Endeavour. For more information visit, www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts134/index.html. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. -- The STS-134 crew members arrived on the Shuttle Landing Facility at NASA's Kennedy Space Center in Florida at about 9 a.m. EDT to get ready for space shuttle Endeavour's launch to the International Space Station scheduled for Monday, May 16 at 8:56 a.m. Facing the media are from right, Commander Mark Kelly, Mission Specialists Greg Chamitoff, Andrew Feustel, European Space Agency astronaut Roberto Vittori, at the microphone, Michael Fincke and Pilot Greg H. Johnson. Endeavour and its crew will deliver the Express Logistics Carrier-3, Alpha Magnetic Spectrometer-2 (AMS), a high-pressure gas tank and additional spare parts for the Dextre robotic helper to the station. This will be the final spaceflight for Endeavour. For more information visit, www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts134/index.html. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. -- In the Press Site auditorium at NASA's Kennedy Space Center in Florida, NASA managers brief media about the launch status of space shuttle Endeavour's STS-134 mission. From left are NASA Public Affairs Officer Candrea Thomas, Space Shuttle Program Launch Integration Manager, Mike Moses, Shuttle Launch Director, Mike Leinbach, and Shuttle Weather Officer, Kathy Winters. Endeavour and its crew will deliver the Express Logistics Carrier-3, Alpha Magnetic Spectrometer-2 (AMS), a high-pressure gas tank and additional spare parts for the Dextre robotic helper to the International Space Station. Launch is scheduled for April 29 at 3:47 p.m. EDT. This will be the final spaceflight for Endeavour. For more information visit, www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts134/index.html. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. -- At NASA's Kennedy Space Center in Florida, media gather outside of Orbiter Processing Facility-2 to photograph space shuttle Endeavour's move, or "rollover," to the Vehicle Assembly Building (VAB). In the VAB, Endeavour will be lifted into a high bay where it will be attached to its external fuel tank and solid rocket boosters for its final and upcoming STS-134 mission. Endeavour and its STS-134 crew will deliver the Express Logistics Carrier-3, Alpha Magnetic Spectrometer, spare parts, a high-pressure gas tank, additional spare parts for Dextre and micrometeoroid debris shields to the International Space Station. Launch is targeted for April 19 at 7:48 p.m. EDT. For more information visit, http://www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts134/index.html. Photo credit: NASA

KENNEDY SPACE CENTER, FLA. -- At NASA Kennedy Space Center's Launch Pad 39A, the pilot of space shuttle Endeavour's STS-123 mission, Gregory H. Johnson, answers a question from the media during a break from emergency egress training. The crew is at Kennedy for a full launch dress rehearsal, known as the terminal countdown demonstration test or TCDT. The terminal countdown demonstration test provides astronauts and ground crews with an opportunity to participate in various simulated countdown activities, including equipment familiarization and emergency training. Endeavour is targeted to launch March 11 at 2:28 a.m. EDT on a 16-day mission to the International Space Station. On the mission, Endeavour and its crew will deliver the first section of the Japan Aerospace Exploration Agency's Kibo laboratory and the Canadian Space Agency's two-armed robotic system, Dextre. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. – STS-127 crew members gather at NASA Kennedy Space Center's Launch Pad 39A for a question-and-answer session with the media. At left is Commander Mark Polansky, introducing the other astronauts, who are, from left, Pilot Doug Hurley and Mission Specialists Julie Payette, Tom Marshburn, Tim Kopra, Chris Cassidy and Dave Wolf. Payette represents the Canadian Space Agency. In the background is the fixed service structure with the solid rocket boosters and external fuel tank attached to space shuttle Endeavour. The crew is at Kennedy for a launch dress rehearsal called the terminal countdown demonstration test, or TCDT, which includes emergency egress training and equipment familiarization. Space shuttle Endeavour's STS-127 mission is the final of three flights dedicated to the assembly of the Japanese Kibo laboratory complex on the International Space Station. Endeavour's launch is targeted for June 13. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. - On Launch Pad 39A at NASA's Kennedy Space Center in Florida, STS-126 Mission Specialist Heidemarie Stefanyshyn-Piper (far right) answers a question from the media. The other crew members with her are (from left) Commander Chris Ferguson, Pilot Eric Boe and Mission Specialists Steve Bowen, Sandra Magnus, Shane Kimbrough and Donald Pettit. Behind them is space shuttle Endeavour. The crew is at Kennedy to take part in the Terminal Countdown Demonstration Test, which includes equipment familiarization, emergency exit procedures and a simulated launch 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

CAPE CANAVERAL, Fla. – At a post-landing news conference at NASA's Kennedy Space Center in Florida, participants respond with smiles to a question from the media. From left are NASA Associate Administrator for Space Operations William Gerstenmaier, President of the Japan Aerospace Exploration Agency Keiji Tachikawa, Director General of Operations in the Canadian Space Agency Benoit Marcotte, space shuttle Launch Integration Manager Mike Moses and STS-127 Launch Director Pete Nickolenko. Space shuttle Endeavour and crew returned to Earth at 10:48 a.m. EDT to conclude the STS-127 mission. Endeavour delivered the Japanese Experiment Module's Exposed Facility and the Experiment Logistics Module-Exposed Section to the International Space Station. The mission was the 29th flight to the station, the 23rd flight of Endeavour and the 127th in the Space Shuttle Program, as well as the 71st landing at Kennedy. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. - On Launch Pad 39A at NASA's Kennedy Space Center in Florida, the STS-126 crew is ready to answer questions from the media about their mission. Commander Chris Ferguson, at left, introduces his crew: (from left) Pilot Eric Boe and Mission Specialists Steve Bowen, Sandra Magnus, Shane Kimbrough, Donald Pettit and Heidemarie Stefanyshyn-Piper. Behind them is space shuttle Endeavour. The crew is at Kennedy to take part in the Terminal Countdown Demonstration Test, which includes equipment familiarization, emergency exit procedures and a simulated launch 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

CAPE CANAVERAL, Fla. - With space shuttle Endeavour as the backdrop on Launch Pad 39 at NASA's Kennedy Space Center in Florida, the STS-126 crew members pose for a final photo after answering questions from the media. From left are Commander Chris Ferguson, Pilot Eric Boe and Mission Specialists Steve Bowen, Sandra Magnus, Shane Kimbrough, Donald Pettit and Heidemarie Stefanyshyn-Piper. The crew is at Kennedy to take part in the Terminal Countdown Demonstration Test, which includes equipment familiarization, emergency exit procedures and a simulated launch 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

CAPE CANAVERAL, Fla. -- Media capture the launch of space shuttle Endeavour on the STS-134 mission to the International Space Station from the Press Site at NASA's Kennedy Space Center in Florida. The shuttle and its six-member crew lifted off on time at 8:56 a.m. EDT on May 16. STS-134 will deliver the Alpha Magnetic Spectrometer-2 (AMS), Express Logistics Carrier-3, a high-pressure gas tank and additional spare parts for the Dextre robotic helper to the International Space Station. Endeavour's first launch attempt on April 29 was scrubbed because of an issue associated with a faulty power distribution box called the aft load control assembly-2 (ALCA-2). STS-134 will be the final spaceflight for Endeavour. For more information visit, www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts134/index.html. Photo credit: NASA/Troy Cryder

CAPE CANAVERAL, Fla. -- STS-134 Pilot Greg H. Johnson listens to Commander Mark Kelly address the media on the Shuttle Landing Facility at NASA's Kennedy Space Center in Florida. While at Kennedy, space shuttle Endeavour's crew will participate in a launch countdown dress rehearsal called the Terminal Countdown Demonstration Test (TCDT) and related training in preparation for the upcoming STS-134 mission. Endeavour and its six STS-134 crew members will deliver the Express Logistics Carrier-3, Alpha Magnetic Spectrometer-2 (AMS), a high-pressure gas tank, additional spare parts for the Dextre robotic helper and micrometeoroid debris shields to the International Space Station. This will be the final spaceflight for Endeavour. Launch is targeted for April 19 at 7:48 p.m. EDT. For more information visit, www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts134/index.html. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. -- After arrival at the Shuttle Landing Facility at NASA's Kennedy Space Center in Florida, Commander Mark Kelly speaks to the media. The STS-134 crew members landed at 12:52 p.m. EDT to get ready for space shuttle Endeavour's launch to the International Space Station scheduled for Friday, April 29 at 3:47 p.m. Endeavour and its crew will deliver the Express Logistics Carrier-3, Alpha Magnetic Spectrometer-2 (AMS), a high-pressure gas tank and additional spare parts for the Dextre robotic helper to the station. This will be the final spaceflight for Endeavour. For more information visit, www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts134/index.html. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. -- STS-134 Mission Specialist Andrew Feustel listens to Commander Mark Kelly address the media on the Shuttle Landing Facility at NASA's Kennedy Space Center in Florida. While at Kennedy, space shuttle Endeavour's crew will participate in a launch countdown dress rehearsal called the Terminal Countdown Demonstration Test (TCDT) and related training in preparation for the upcoming STS-134 mission. Endeavour and its six STS-134 crew members will deliver the Express Logistics Carrier-3, Alpha Magnetic Spectrometer-2 (AMS), a high-pressure gas tank, additional spare parts for the Dextre robotic helper and micrometeoroid debris shields to the International Space Station. This will be the final spaceflight for Endeavour. Launch is targeted for April 19 at 7:48 p.m. EDT. For more information visit, www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts134/index.html. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. -- At the Shuttle Landing Facility at NASA's Kennedy Space Center in Florida, STS-134 Mission Specialist Greg Chamitoff is photographed as he speaks to media. The STS-134 crew members landed at about 9 a.m. EDT for final preparations for Endeavour's liftoff to the International Space Station scheduled for Monday, May 16 at 8:56 a.m. Endeavour and its crew will deliver the Express Logistics Carrier-3, Alpha Magnetic Spectrometer-2 (AMS), a high-pressure gas tank and additional spare parts for the Dextre robotic helper to the station. This will be the final spaceflight for Endeavour. For more information visit, www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts134/index.html. Photo credit: NASA/Kim Shiflett

KENNEDY SPACE CENTER, FLA. -- At NASA Kennedy Space Center's Launch Pad 39A, a mission specialist on space shuttle Endeavour's STS-123 mission, Mike Foreman, prepares to take questions from the media during a break from emergency egress training. The crew is at Kennedy for a full launch dress rehearsal, known as the terminal countdown demonstration test or TCDT. The terminal countdown demonstration test provides astronauts and ground crews with an opportunity to participate in various simulated countdown activities, including equipment familiarization and emergency training. Endeavour is targeted to launch March 11 at 2:28 a.m. EDT on a 16-day mission to the International Space Station. On the mission, Endeavour and its crew will deliver the first section of the Japan Aerospace Exploration Agency's Kibo laboratory and the Canadian Space Agency's two-armed robotic system, Dextre. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. -- At NASA's Kennedy Space Center in Florida, media gather outside of Orbiter Processing Facility-2 to photograph space shuttle Endeavour's move, or "rollover," to the Vehicle Assembly Building (VAB). In the VAB, Endeavour will be lifted into a high bay where it will be attached to its external fuel tank and solid rocket boosters for its final and upcoming STS-134 mission. Endeavour and its STS-134 crew will deliver the Express Logistics Carrier-3, Alpha Magnetic Spectrometer, spare parts, a high-pressure gas tank, additional spare parts for Dextre and micrometeoroid debris shields to the International Space Station. Launch is targeted for April 19 at 7:48 p.m. EDT. For more information visit, http://www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts134/index.html. Photo credit: NASA

CAPE CANAVERAL, Fla. -- The STS-134 crew members arrived on the Shuttle Landing Facility at NASA's Kennedy Space Center in Florida at 9 a.m. EDT to get ready for space shuttle Endeavour's launch to the International Space Station scheduled for Monday, May 16 at 8:56 a.m. Facing the media are from left, Commander Mark Kelly, at the microphone, Pilot Greg H. Johnson, Mission Specialist Michael Fincke, European Space Agency astronaut Roberto Vittori, Andrew Feustel and Greg Chamitoff. Endeavour and its crew will deliver the Express Logistics Carrier-3, Alpha Magnetic Spectrometer-2 (AMS), a high-pressure gas tank and additional spare parts for the Dextre robotic helper to the station. This will be the final spaceflight for Endeavour. For more information visit, www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts134/index.html. Photo credit: NASA/Jack Pfaller

CAPE CANAVERAL, Fla. -- Boeing Space Operation's STS-134 Payload Flow Manager Bob Hart talks to media with space shuttle Endeavour and its primary payload in the background on Launch Pad 39A at NASA's Kennedy Space Center in Florida. The Alpha Magnetic Spectrometer-2 (AMS) and Express Logistics Carrier-3 are scheduled to be installed into the shuttle's cargo bay March 25. Endeavour and its six-member STS-134 crew are targeted to lift off April 19 at 7:48 p.m. EDT to deliver the payload to the International Space Station. This is Endeavour's final scheduled mission. For more information visit, www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts134/index.html. Photo credit: NASA/Frankie Martin

CAPE CANAVERAL, Fla. -- At NASA's Kennedy Space Center in Florida, media photograph space shuttle Endeavour's move, or "rollover," to the Vehicle Assembly Building (VAB) from Orbiter Processing Facility-2. In the VAB, Endeavour will be lifted into a high bay where it will be attached to its external fuel tank and solid rocket boosters for its final and upcoming STS-134 mission. Endeavour and its STS-134 crew will deliver the Express Logistics Carrier-3, Alpha Magnetic Spectrometer, spare parts, a high-pressure gas tank, additional spare parts for Dextre and micrometeoroid debris shields to the International Space Station. Launch is targeted for April 19 at 7:48 p.m. EDT. For more information visit, http://www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts134/index.html. Photo credit: NASA

CAPE CANAVERAL, Fla. -- STS-134 Mission Specialist Michael Fincke listens to Commander Mark Kelly address the media on the Shuttle Landing Facility at NASA's Kennedy Space Center in Florida. While at Kennedy, space shuttle Endeavour's crew will participate in a launch countdown dress rehearsal called the Terminal Countdown Demonstration Test (TCDT) and related training in preparation for the upcoming STS-134 mission. Endeavour and its six STS-134 crew members will deliver the Express Logistics Carrier-3, Alpha Magnetic Spectrometer-2 (AMS), a high-pressure gas tank, additional spare parts for the Dextre robotic helper and micrometeoroid debris shields to the International Space Station. This will be the final spaceflight for Endeavour. Launch is targeted for April 19 at 7:48 p.m. EDT. For more information visit, www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts134/index.html. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. -- At the Shuttle Landing Facility at NASA's Kennedy Space Center in Florida, STS-134 Commander Mark Kelly is photographed as he speaks to media. The STS-134 crew members landed at about 9 a.m. EDT for final preparations for Endeavour's liftoff to the International Space Station scheduled for Monday, May 16 at 8:56 a.m. Endeavour and its crew will deliver the Express Logistics Carrier-3, Alpha Magnetic Spectrometer-2 (AMS), a high-pressure gas tank and additional spare parts for the Dextre robotic helper to the station. This will be the final spaceflight for Endeavour. For more information visit, www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts134/index.html. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. -- STS-134 Mission Specialist Roberto Vittori, with the European Space Agency, listens to Commander Mark Kelly address the media on the Shuttle Landing Facility at NASA's Kennedy Space Center in Florida. While at Kennedy, space shuttle Endeavour's crew will participate in a launch countdown dress rehearsal called the Terminal Countdown Demonstration Test (TCDT) and related training in preparation for the upcoming STS-134 mission. Endeavour and its six STS-134 crew members will deliver the Express Logistics Carrier-3, Alpha Magnetic Spectrometer-2 (AMS), a high-pressure gas tank, additional spare parts for the Dextre robotic helper and micrometeoroid debris shields to the International Space Station. This will be the final spaceflight for Endeavour. Launch is targeted for April 19 at 7:48 p.m. EDT. For more information visit, www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts134/index.html. Photo credit: NASA/Kim Shiflett