CAPE CANAVERAL, Fla. – STS-134 pilot Greg Johnson speaks to guests about the final mission of the space shuttle Endeavour at the Visitor Complex of NASA's Kennedy Space Center in Florida. STS-134 commander Mark Kelly, pilot Greg Johnson and Mission Specialists Michael Fincke, Gregory Chamitoff, Andrew Feustel and European Space Agency astronaut Roberto Vittori lifted off May 16, 2011 aboard space shuttle Endeavour. During the nearly 16-day STS-134 mission, Endeavour delivered to the International Space Station the Alpha Magnetic Spectrometer and spare parts, including two S-band communications antennas and a high-pressure gas tank. This was the 36th shuttle mission to the station and Endeavour's 25th and final flight. For more information, visit: www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts134/main/index.html Photo credit: NASA/Jim Grossmann

CAPE CANAVERAL, Fla. – STS-134 mission specialist Gregory Chamitoff speaks to guests about the final mission of the space shuttle Endeavour at the Visitor Complex of NASA's Kennedy Space Center in Florida. STS-134 commander Mark Kelly, pilot Greg Johnson and Mission Specialists Michael Fincke, Gregory Chamitoff, Andrew Feustel and European Space Agency astronaut Roberto Vittori lifted off May 16, 2011 aboard space shuttle Endeavour. During the nearly 16-day STS-134 mission, Endeavour delivered to the International Space Station the Alpha Magnetic Spectrometer and spare parts, including two S-band communications antennas and a high-pressure gas tank. This was the 36th shuttle mission to the station and Endeavour's 25th and final flight. For more information, visit: www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts134/main/index.html Photo credit: NASA/Jim Grossmann

CAPE CANAVERAL, Fla. – STS-134 mission specialist Michael Fincke speaks to guests about the final mission of the space shuttle Endeavour at the Visitor Complex of NASA's Kennedy Space Center in Florida. STS-134 commander Mark Kelly, pilot Greg Johnson and Mission Specialists Michael Fincke, Gregory Chamitoff, Andrew Feustel and European Space Agency astronaut Roberto Vittori lifted off May 16, 2011 aboard space shuttle Endeavour. During the nearly 16-day STS-134 mission, Endeavour delivered to the International Space Station the Alpha Magnetic Spectrometer and spare parts, including two S-band communications antennas and a high-pressure gas tank. This was the 36th shuttle mission to the station and Endeavour's 25th and final flight. For more information, visit: www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts134/main/index.html Photo credit: NASA/Jim Grossmann

CAPE CANAVERAL, Fla. – STS-134 mission specialist Andrew Feustel speaks to guests about the final mission of the space shuttle Endeavour at the Visitor Complex of NASA's Kennedy Space Center in Florida. STS-134 commander Mark Kelly, pilot Greg Johnson and Mission Specialists Michael Fincke, Gregory Chamitoff, Andrew Feustel and European Space Agency astronaut Roberto Vittori lifted off May 16, 2011 aboard space shuttle Endeavour. During the nearly 16-day STS-134 mission, Endeavour delivered to the International Space Station the Alpha Magnetic Spectrometer and spare parts, including two S-band communications antennas and a high-pressure gas tank. This was the 36th shuttle mission to the station and Endeavour's 25th and final flight. For more information, visit: www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts134/main/index.html Photo credit: NASA/Jim Grossmann

CAPE CANAVERAL, Fla. – Four members of the STS-134 crew presented a mission overview at the Visitor Complex of NASA's Kennedy Space Center in Florida. Participating in the event, from the left, former astronaut Jon McBride, STS-134 astronauts Andrew Feustel, Greg Johnson, Michael Fincke, Gregory Chamitoff and former astronaut Bruce Melnick. STS-134 commander Mark Kelly, pilot Greg Johnson and Mission Specialists Michael Fincke, Gregory Chamitoff, Andrew Feustel and European Space Agency astronaut Roberto Vittori lifted off May 16, 2011 aboard space shuttle Endeavour. During the nearly 16-day STS-134 mission, Endeavour delivered to the International Space Station the Alpha Magnetic Spectrometer and spare parts, including two S-band communications antennas and a high-pressure gas tank. This was the 36th shuttle mission to the station and Endeavour's 25th and final flight. For more information, visit: www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts134/main/index.html Photo credit: NASA/Jim Grossmann

CAPE CANAVERAL, Fla. – Four members of the STS-134 crew answer questions as part of a mission overview at the Visitor Complex of NASA's Kennedy Space Center in Florida. Participating in the event, seated, from the left, former astronaut Bruce Melnick, along with Greg Johnson, Michael Fincke, Andrew Feustel and Gregory Chamitoff. STS-134 commander Mark Kelly, pilot Greg Johnson and Mission Specialists Michael Fincke, Gregory Chamitoff, Andrew Feustel and European Space Agency astronaut Roberto Vittori lifted off May 16, 2011 aboard space shuttle Endeavour. During the nearly 16-day STS-134 mission, Endeavour delivered to the International Space Station the Alpha Magnetic Spectrometer and spare parts, including two S-band communications antennas and a high-pressure gas tank. This was the 36th shuttle mission to the station and Endeavour's 25th and final flight. For more information, visit: www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts134/main/index.html Photo credit: NASA/Jim Grossmann

CAPE CANAVERAL, Fla. – Four members of the STS-134 crew answer questions as part of a mission overview at the Visitor Complex of NASA's Kennedy Space Center in Florida. Participating in the event, seated, from the left, former astronaut Bruce Melnick, along with Greg Johnson, Michael Fincke, Andrew Feustel and Gregory Chamitoff. STS-134 commander Mark Kelly, pilot Greg Johnson and Mission Specialists Michael Fincke, Gregory Chamitoff, Andrew Feustel and European Space Agency astronaut Roberto Vittori lifted off May 16, 2011 aboard space shuttle Endeavour. During the nearly 16-day STS-134 mission, Endeavour delivered to the International Space Station the Alpha Magnetic Spectrometer and spare parts, including two S-band communications antennas and a high-pressure gas tank. This was the 36th shuttle mission to the station and Endeavour's 25th and final flight. For more information, visit: www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts134/main/index.html Photo credit: NASA/Jim Grossmann