
CAPE CANAVERAL, Fla. -- At the Shuttle Landing Facility at NASA's Kennedy Space Center in Florida, STS-134 Mission Specialists Andrew Feustel (left), European Space Agency astronaut Roberto Vittori and Michael Fincke are photographed after their arrival. 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. -- At the Shuttle Landing Facility at NASA's Kennedy Space Center in Florida, STS-134 Pilot Greg H. Johnson is photographed after his arrival. 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. -- At the Shuttle Landing Facility at NASA's Kennedy Space Center in Florida, European Space Agency astronaut Roberto Vittori, STS-134 Mission Specialist, is photographed after his arrival. 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. -- At the Shuttle Landing Facility at NASA's Kennedy Space Center in Florida, European Space Agency astronaut Roberto Vittori, STS-134 Mission Specialist, is photographed after his arrival. 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. -- 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. -- At the Shuttle Landing Facility at NASA's Kennedy Space Center in Florida, Mission Specialist Andrew Fuestel is photographed after his arrival. 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. -- 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. -- At NASA Kennedy Space Center's Shuttle Landing Facility in Florida, the STS-134 crew members are greeted by Shuttle Launch Director Mike Leinbach after the crew's arrival for shuttle Endeavour's liftoff to the International Space Station scheduled for Monday, May 16 at 8:56 a.m. EDT. From right are Commander Mark Kelly (partially obscured), Pilot Greg H. Johnson, Mission Specialists 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/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. From left are Commander Mark Kelly, at the microphone, Mission Specialists Greg Chamitoff, Andrew Feustel, European Space Agency astronaut Roberto Vittori, 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. -- 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. From left are 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.htmlPhoto 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. From left are Commander Mark Kelly, Mission Specialists Greg Chamitoff, Andrew Feustel, European Space Agency astronaut Roberto Vittori, Michael Fincke, at the microphone 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. -- 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. From left are Commander Mark Kelly, Mission Specialists Greg Chamitoff, Andrew Feustel, at the microphone, European Space Agency astronaut Roberto Vittori, 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. -- 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. -- The six STS-134 astronauts pause for a photo after arrival at NASA Kennedy Space Center's Shuttle Landing Facility in Florida, to begin final launch preparations for space shuttle Endeavour's mission to the International Space Station scheduled for Monday, May 16 at 8:56 a.m. From left are Commander Mark Kelly, Mission Specialists Greg Chamitoff, Andrew Feustel, European Space Agency astronaut Roberto Vittori,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. -- 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. From left are Commander Mark Kelly, Mission Specialists Greg Chamitoff, Andrew Feustel, European Space Agency astronaut Roberto Vittori, Michael Fincke and Pilot Greg H. Johnson, at the microphone. 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. -- The six STS-134 astronauts pause for a photo after arrival at NASA Kennedy Space Center's Shuttle Landing Facility in Florida, to begin final launch preparations for space shuttle Endeavour's mission to the International Space Station scheduled for Monday, May 16 at 8:56 a.m. From left are Commander Mark Kelly, Mission Specialists Greg Chamitoff, Andrew Feustel, European Space Agency astronaut Roberto Vittori, 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. -- At the Shuttle Landing Facility at NASA's Kennedy Space Center in Florida, European Space Agency astronaut Roberto Vittori (left) and Michael Fincke, both mission specialists, are photographed after their arrival. 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. -- 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. From left are Commander Mark Kelly, Mission Specialists Greg Chamitoff, at the microphone, Andrew Feustel, European Space Agency astronaut Roberto Vittori, 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. -- 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

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. -- 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 while Commander Mark Kelly (left) and Mission Specialist Andrew Fuestel look on. 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. -- At the Shuttle Landing Facility at NASA's Kennedy Space Center in Florida, STS-134 Pilot Greg H. Johnson 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. -- At NASA Kennedy Space Center's Shuttle Landing Facility in Florida, STS-134 Commander Mark Kelly (right) and Pilot Greg H. Johnson disembark from the Shuttle Training Aircraft. The STS-134 crew members landed at about 9 a.m. EDT to get ready for space shuttle 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. - At NASA's Kennedy Space Center in Florida, space shuttle Endeavour arrives outside Orbiter Processing Facility-2. Endeavour's touchdown at Kennedy's Shuttle Landing Facility following the STS-130 mission to the International Space Station was at 10:20 p.m. EST Feb. 21. Processing now will begin for Endeavour's next flight, STS-134. The six-member STS-134 crew will deliver Express Logistics Carrier 3 and the Alpha Magnetic Spectrometer to the International Space Station, as well as a variety of spare parts including two S-band communications antennas, a high-pressure gas tank, additional spare parts for Dextre and micrometeoroid debris shields. STS-134 will be the 35th shuttle mission to the station and the 133rd flight in the shuttle program. Launch is targeted for July 29. For information on the STS-134 mission and crew, visit http:__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, space shuttle Endeavour arrives in Orbiter Processing Facility-2. Endeavour's touchdown at Kennedy's Shuttle Landing Facility following the STS-130 mission to the International Space Station was at 10:20 p.m. EST Feb. 21. Processing now will begin for Endeavour's next flight, STS-134. The six-member STS-134 crew will deliver Express Logistics Carrier 3 and the Alpha Magnetic Spectrometer to the International Space Station, as well as a variety of spare parts including two S-band communications antennas, a high-pressure gas tank, additional spare parts for Dextre and micrometeoroid debris shields. STS-134 will be the 35th shuttle mission to the station and the 133rd flight in the shuttle program. Launch is targeted for July 29. For information on the STS-134 mission and crew, visit http:__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, the ExPRESS Logistics Carrier 3, or ELC-3, arrives at the Space Station Processing Facility. ELC-3 and the Alpha Magnetic Spectrometer are the primary payloads for space shuttle Endeavour's STS-134 mission to the International Space Station. The STS-134 crew will also deliver spare parts including two S-band communications antennas, a high pressure gas tank, additional spare parts for Dextre and micrometeoroid debris shields. Endeavour's launch is targeted for July 29, 2010. For information on the STS-134 mission objectives and crew, visit http://www.nasa.gov/shuttle. Photo credit: NASA/Kim Shiflett

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. -- STS-134 Mission Specialist Greg Chamitoff greets Dana Hutcherson, space shuttle Endeavour's NASA flow manager, after arriving on the Shuttle Landing Facility at NASA's Kennedy Space Center in Florida aboard a T-38 jet. 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. -- Shuttle Launch Director Mike Leinbach, right, greets STS-134 Commander Mark Kelly, who arrived on the Shuttle Landing Facility at NASA's Kennedy Space Center in Florida aboard a T-38 jet. 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. -- STS-134 Commander Mark Kelly arrives on the Shuttle Landing Facility at NASA's Kennedy Space Center in Florida aboard a T-38 jet. 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. -- Shuttle Launch Director Mike Leinbach, right, is on hand to greet STS-134 Mission Specialist Andrew Feustel who arrived on the Shuttle Landing Facility at NASA's Kennedy Space Center in Florida aboard a T-38 jet. 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. -- STS-134 Commander Mark Kelly, left, and Mission Specialist Michael Fincke arrive on the Shuttle Landing Facility at NASA's Kennedy Space Center in Florida aboard a T-38 jet. 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. -- Shuttle Launch Director Mike Leinbach, right, is on hand to greet STS-134 Pilot Greg H. Johnson who arrived on the Shuttle Landing Facility at NASA's Kennedy Space Center in Florida aboard a T-38 jet. 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. -- Shuttle Launch Director Mike Leinbach greets STS-134 Mission Specialist Michael Fincke, who arrived on the Shuttle Landing Facility at NASA's Kennedy Space Center in Florida aboard a T-38 jet. 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. -- STS-134 Pilot Greg H. Johnson, left, and Mission Specialist Roberto Vittori, with the European Space Agency, arrive on the Shuttle Landing Facility at NASA's Kennedy Space Center in Florida aboard a T-38 jet. 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. -- STS-134 Mission Specialist Greg Chamitoff arrives on the Shuttle Landing Facility at NASA's Kennedy Space Center in Florida aboard a T-38 jet. 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

STS-134 crew members, Commander Mark Kelly, Mission Specialists Greg Chamitoff, Andrew Feustel, Pilot Greg H. Johnson, Mission Specialist Mike Fincke and European Space Agency astronaut Roberto Vittori wave following their arrival to Kennedy Space Center, Tuesday, April 26, 2011, in Cape Canaveral, Fla. The six astronauts for space shuttle Endeavour's STS-134 mission to the International Space Station arrived at Kennedy's Shuttle Landing Facility (SLF) in T-38 jets early Tuesday afternoon. Photo Credit: (NASA/Bill Ingalls)

STS-134 Commander Mark Kelly, center, along with his crew speaks to the media following their arrival to Kennedy Space Center, Tuesday, April 26, 2011, in Cape Canaveral, Fla. From left are Mission Specialists Greg Chamitoff, Andrew Feustel, Kelly, Pilot Greg H. Johnson, Mission Specialist Mike Fincke and European Space Agency astronaut Roberto Vittori. The six astronauts for space shuttle Endeavour's STS-134 mission to the International Space Station arrived at Kennedy's Shuttle Landing Facility (SLF) in T-38 jets early Tuesday afternoon. Photo Credit: (NASA/Bill Ingalls)

STS-134 Commander Mark Kelly, center, along with his crew pose for a photograph following their arrival to Kennedy Space Center, Tuesday, April 26, 2011, in Cape Canaveral, Fla. From left are Mission Specialists Greg Chamitoff, Andrew Feustel, Kelly, Pilot Greg H. Johnson, Mission Specialist Mike Fincke and European Space Agency astronaut Roberto Vittori. The six astronauts for space shuttle Endeavour's STS-134 mission to the International Space Station arrived at Kennedy's Shuttle Landing Facility (SLF) in T-38 jets early Tuesday afternoon. Photo Credit: (NASA/Bill Ingalls)

CAPE CANAVERAL, Fla. – External tank 134 has arrived in the transfer aisle of the Vehicle Assembly Building, or VAB, at NASA's Kennedy Space Center in Florida. The Pegasus barge, carrying the fuel tank, arrived in Florida after an ocean voyage towed by a solid rocket booster retrieval ship from NASA's Michoud Assembly Facility near New Orleans. ET-134 will be used to launch space shuttle Endeavour on the STS-130 mission to the International Space Station. Launch is targeted for Feb. 4, 2010. For information on the components of the space shuttle and the STS-130 mission, visit http://www.nasa.gov/shuttle. Photo credit: NASA/Jack Pfaller

STS-134 Commander Mark Kelly, center, along with his crew speaks to the media following their arrival to Kennedy Space Center, Tuesday, April 26, 2011, in Cape Canaveral, Fla. From left are Mission Specialists Greg Chamitoff, Andrew Feustel, Kelly, Pilot Greg H. Johnson, Mission Specialist Mike Fincke and European Space Agency astronaut Roberto Vittori. The six astronauts for space shuttle Endeavour's STS-134 mission to the International Space Station arrived at Kennedy's Shuttle Landing Facility (SLF) in T-38 jets early Tuesday afternoon. Photo Credit: (NASA/Bill Ingalls)

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. -- 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. - In the Space Station Processing Facility at NASA's Kennedy Space Center in Florida, the newly arrived ExPRESS Logistics Carrier 3, or ELC-3, is lifted above two Multi-Purpose Logistics Modules positioned along the wall of the clean room. ELC-3 and the Alpha Magnetic Spectrometer are the primary payloads for space shuttle Endeavour's STS-134 mission to the International Space Station. The STS-134 crew will also deliver spare parts including two S-band communications antennas, a high pressure gas tank, additional spare parts for Dextre and micrometeoroid debris shields. Endeavour's launch is targeted for July 29, 2010. For information on the STS-134 mission objectives and crew, visit http://www.nasa.gov/shuttle. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. - In the Space Station Processing Facility at NASA's Kennedy Space Center in Florida, workers secure the newly arrived ExPRESS Logistics Carrier 3, or ELC-3, on its work stand in the clean room. ELC-3 and the Alpha Magnetic Spectrometer are the primary payloads for space shuttle Endeavour's STS-134 mission to the International Space Station. The STS-134 crew will also deliver spare parts including two S-band communications antennas, a high pressure gas tank, additional spare parts for Dextre and micrometeoroid debris shields. Endeavour's launch is targeted for July 29, 2010. For information on the STS-134 mission objectives and crew, visit http://www.nasa.gov/shuttle. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. - In the Space Station Processing Facility at NASA's Kennedy Space Center in Florida, the newly arrived ExPRESS Logistics Carrier 3, or ELC-3, is lowered onto a work stand in the clean room. ELC-3 and the Alpha Magnetic Spectrometer are the primary payloads for space shuttle Endeavour's STS-134 mission to the International Space Station. The STS-134 crew will also deliver spare parts including two S-band communications antennas, a high pressure gas tank, additional spare parts for Dextre and micrometeoroid debris shields. Endeavour's launch is targeted for July 29, 2010. For information on the STS-134 mission objectives and crew, visit http://www.nasa.gov/shuttle. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. - At the Shuttle Landing Facility at NASA's Kennedy Space Center in Florida, the ExPRESS Logistics Carrier 3, or ELC-3, is secured on the bed of the truck which will transport it to the Space Station Processing Facility. At left is the U.S. Air Force C-5 aircraft on which it arrived. ELC-3 and the Alpha Magnetic Spectrometer are the primary payloads for space shuttle Endeavour's STS-134 mission to the International Space Station. The STS-134 crew will also deliver spare parts including two S-band communications antennas, a high pressure gas tank, additional spare parts for Dextre and micrometeoroid debris shields. Endeavour's launch is targeted for July 29, 2010. For information on the STS-134 mission objectives and crew, visit http://www.nasa.gov/shuttle. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. - In the Space Station Processing Facility at NASA's Kennedy Space Center in Florida, the newly arrived ExPRESS Logistics Carrier 3, or ELC-3, is lifted high above the clean room floor. ELC-3 and the Alpha Magnetic Spectrometer are the primary payloads for space shuttle Endeavour's STS-134 mission to the International Space Station. The STS-134 crew will also deliver spare parts including two S-band communications antennas, a high pressure gas tank, additional spare parts for Dextre and micrometeoroid debris shields. Endeavour's launch is targeted for July 29, 2010. For information on the STS-134 mission objectives and crew, visit http://www.nasa.gov/shuttle. Photo credit: NASA/Kim Shiflett

S134-E-006436 (17 May 20110) --- NASA astronauts Greg Chamitoff (left), mission specialist, and Mark Kelly, mission commander, work on separate chores on Endeavour's middeck during the second flight day of the STS-134 mission. Chamitoff is holding Cube Lab Module ? 8. Kelly is unpacking canisters of the Group Activation Pack. Endeavour and its crew of six astronauts will arrive at the International Space Station in less than 24 hours. Photo credit: NASA

CAPE CANAVERAL, Fla. -- A canister, carrying the Alpha Magnetic Spectrometer-2 (AMS) and Express Logistics Carrier-3 for space shuttle Endeavour's STS-134 mission, arrives at Launch Pad 39A at NASA's Kennedy Space Center in Florida. Next, crews at the pad will move the payload into the Payload Ground Handling Mechanism (PGHM), and the rotating service structure (RSS) that protects the shuttle from the elements and provides access to its components will be rotated back into place. The payload is 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/Cory Huston

CAPE CANAVERAL, Fla. -- A canister, carrying the Alpha Magnetic Spectrometer-2 (AMS) and Express Logistics Carrier-3 for space shuttle Endeavour's STS-134 mission, arrives at Launch Pad 39A at NASA's Kennedy Space Center in Florida. Next, crews at the pad will move the payload into the Payload Ground Handling Mechanism (PGHM), and the rotating service structure (RSS) that protects the shuttle from the elements and provides access to its components will be rotated back into place. The payload is 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/Cory Huston

CAPE CANAVERAL, Fla. -- A canister, carrying the Alpha Magnetic Spectrometer-2 (AMS) and Express Logistics Carrier-3 for space shuttle Endeavour's STS-134 mission, arrives at Launch Pad 39A at NASA's Kennedy Space Center in Florida. Next, crews at the pad will move the payload into the Payload Ground Handling Mechanism (PGHM), and the rotating service structure (RSS) that protects the shuttle from the elements and provides access to its components will be rotated back into place. The payload is 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/Cory Huston

CAPE CANAVERAL, Fla. -- At NASA Kennedy Space Center's Shuttle Landing Facility in Florida, STS-134 crew members, Pilot Greg H. Johnson and European Space Agency astronaut Roberto Vittori greet each other upon arrival. The STS-134 crew landed at 12:52 p.m. EDT to prepare for 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. -- A canister, carrying the Alpha Magnetic Spectrometer-2 (AMS) and Express Logistics Carrier-3 for space shuttle Endeavour's STS-134 mission, arrives at Launch Pad 39A at NASA's Kennedy Space Center in Florida. Next, crews at the pad will move the payload into the Payload Ground Handling Mechanism (PGHM), and the rotating service structure (RSS) that protects the shuttle from the elements and provides access to its components will be rotated back into place. The payload is 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/Cory Huston

CAPE CANAVERAL, Fla. -- A canister, carrying the Alpha Magnetic Spectrometer-2 (AMS) and Express Logistics Carrier-3 for space shuttle Endeavour's STS-134 mission, arrives at Launch Pad 39A at NASA's Kennedy Space Center in Florida. Next, crews at the pad will move the payload into the Payload Ground Handling Mechanism (PGHM), and the rotating service structure (RSS) that protects the shuttle from the elements and provides access to its components will be rotated back into place. The payload is 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/Cory Huston

CAPE CANAVERAL, Fla. -- A canister, carrying the Alpha Magnetic Spectrometer-2 (AMS) and Express Logistics Carrier-3 for space shuttle Endeavour's STS-134 mission, arrives at Launch Pad 39A at NASA's Kennedy Space Center in Florida. Next, crews at the pad will move the payload into the Payload Ground Handling Mechanism (PGHM), and the rotating service structure (RSS) that protects the shuttle from the elements and provides access to its components will be rotated back into place. The payload is 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/Cory Huston

CAPE CANAVERAL, Fla. -- A canister, carrying the Alpha Magnetic Spectrometer-2 (AMS) and Express Logistics Carrier-3 for space shuttle Endeavour's STS-134 mission, arrives at Launch Pad 39A at NASA's Kennedy Space Center in Florida. Next, crews at the pad will move the payload into the Payload Ground Handling Mechanism (PGHM), and the rotating service structure (RSS) that protects the shuttle from the elements and provides access to its components will be rotated back into place. The payload is 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/Cory Huston

CAPE CANAVERAL, Fla. -- A canister, carrying the Alpha Magnetic Spectrometer-2 (AMS) and Express Logistics Carrier-3 for space shuttle Endeavour's STS-134 mission, arrives at Launch Pad 39A at NASA's Kennedy Space Center in Florida. Next, crews at the pad will move the payload into the Payload Ground Handling Mechanism (PGHM), and the rotating service structure (RSS) that protects the shuttle from the elements and provides access to its components will be rotated back into place. The payload is 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/Cory Huston

CAPE CANAVERAL, Fla. -- At NASA's Kennedy Space Center in Florida, media and workers watch as the Alpha Magnetic Spectrometer (AMS) is offloaded from an Air Force C-5M aircraft on the Shuttle Landing Facility runway. One of NASA's T-38 training jets, flown by a member of the STS-134 crew, is in the foreground. The state-of-the-art particle physics detector arrived from Europe and will operate as an external module on the International Space Station to study the universe and its origin by searching for dark matter. AMS will fly to the station aboard space shuttle Endeavour's STS-134 mission targeted to launch Feb. 26, 2011. Photo credit: NASA/Frankie Martin

CAPE CANAVERAL, Fla. – External tank 134 is towed toward the Vehicle Assembly Building, or VAB, at NASA's Kennedy Space Center in Florida. The Pegasus barge, carrying the fuel tank, arrived in Florida after an ocean voyage towed by a solid rocket booster retrieval ship from NASA's Michoud Assembly Facility near New Orleans. Next, the tank will be transported into the VAB where it will be stored until needed. ET-134 will be used to launch space shuttle Endeavour on the STS-130 mission to the International Space Station. Launch is targeted for Feb. 4, 2010. For information on the components of the space shuttle and the STS-130 mission, visit http://www.nasa.gov/shuttle. Photo credit: NASA/Jack Pfaller

CAPE CANAVERAL, Fla. -- At NASA's Kennedy Space Center in Florida, three of NASA's T-38 training jets sit on the parking apron of the Shuttle Landing Facility. The STS-134 crew members flew the jets to Kennedy to watch the Alpha Magnetic Spectrometer (AMS) arrive aboard an Air Force C-5M aircraft from Europe. The state-of-the-art particle physics detector will operate as an external module on the International Space Station to study the universe and its origin by searching for dark matter. AMS will fly to the station aboard space shuttle Endeavour's STS-134 mission targeted to launch Feb. 26, 2011. Photo credit: NASA/Frankie Martin

CAPE CANAVERAL, Fla. -- At the Shuttle Landing Facility at NASA's Kennedy Space Center in Florida, STS-134 Mission Specialist Michael Fincke pauses for a photo 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. -- At the Shuttle Landing Facility at NASA's Kennedy Space Center in Florida, STS-134 Mission Specialist Andrew Feustel looks on as European Space Agency astronaut Roberto Vittori greets the media after 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. -- At NASA's Kennedy Space Center in Florida, External Tank-138 is being transported to the Vehicle Assembly Building. The external fuel tank arrived in Florida on July 13, from NASA's Michoud Assembly Facility near New Orleans. ET-138, the last newly manufactured tank, was originally designated to fly on Endeavour's STS-134 mission to the International Space Station, but later reassigned to fly on space shuttle Atlantis' final mission, STS-135. For information, visit www.nasa.gov_shuttle. Photo credit: NASA_Jim Grossmann

CAPE CANAVERAL, Fla. -- At the Shuttle Landing Facility at NASA's Kennedy Space Center in Florida, space shuttle Endeavour's STS-134 crew members pause for a photo prior to the arrival of the Alpha Magnetic Spectrometer, or AMS. From left to right are Commander Mark Kelly, Mission Specialists Greg Chamitoff, Andrew Feustel European Space Agency astronaut Roberto Vittori, Mission Specialist Michael Fincke and Pilot Gregory H. Johnson. 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. -- At the Shuttle Landing Facility at NASA's Kennedy Space Center in Florida, space shuttle Endeavour's STS-134 crew is on hand for the arrival of the Alpha Magnetic Spectrometer, or AMS. From left to right are Mission Specialists Greg Chamitoff, Andrew Feustel, European Space Agency astronaut Roberto Vittori, Mission Specialist Michael Fincke and Pilot Gregory H. Johnson. 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. -- Shuttle Launch Director Mike Leinbach, right, is on hand to greet STS-134 Mission Specialist Roberto Vittori, with the European Space Agency, who arrived on the Shuttle Landing Facility at NASA's Kennedy Space Center in Florida aboard a T-38 jet. 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 NASA Kennedy Space Center's Shuttle Landing Facility in Florida, STS-134 Mission Specialist Andrew Feustel is greeted by Kennedy Center Director Bob Cabana after the crew's arrival for final preparations for shuttle Endeavour's liftoff to the International Space Station. 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. -- The crew of space shuttle Endeavour's STS-134 mission arrives at the Shuttle Landing Facility at NASA's Kennedy Space Center aboard T-38 jets to get ready for launch. Seen here is Commander Mark Kelly. The crew arrived at Kennedy 12:52 p.m. EDT to prepare for 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. -- A work stand in the Rotation, Processing and Surge Facility at NASA's Kennedy Space Center in Florida awaits the arrival of the final solid rocket booster segment. The segments will be used for space shuttle Atlantis on what currently is planned as the 'launch on need,' or potential rescue mission for the final shuttle flight, Endeavour's STS-134 mission. For information, visit www.nasa.gov_shuttle. Photo credit: NASA_Cory Huston

CAPE CANAVERAL, Fla. -- Transportation and storage pallets in the Rotation, Processing and Surge Facility at NASA's Kennedy Space Center in Florida await the arrival of the final solid rocket booster segments. The segments will be used for space shuttle Atlantis on what currently is planned as the 'launch on need,' or potential rescue mission for the final shuttle flight, Endeavour's STS-134 mission. For information, visit www.nasa.gov_shuttle. Photo credit: NASA_Cory Huston

CAPE CANAVERAL, Fla. -- At NASA's Kennedy Space Center in Florida, a tractor-trailer carrying the Alpha Magnetic Spectrometer, or AMS, arrives at the Space Station Processing Facility, where it will be processed for launch. The state-of-the-art particle physics detector arrived on Kennedy's Shuttle Landing Facility aboard an Air Force C-5M aircraft from Europe. It will operate as an external module on the International Space Station to study the universe and its origin by searching for dark matter. AMS will fly to the station aboard space shuttle Endeavour's STS-134 mission targeted to launch Feb. 26, 2011. Photo credit: NASA/Frankie Martin

CAPE CANAVERAL, Fla. -- At NASA's Kennedy Space Center in Florida, the Pegasus Barge, carrying the Space Shuttle Program's last external fuel tank, ET-122, arrives at the Turn Basin. The tank traveled 900 miles by sea from NASA's Michoud Assembly Facility in New Orleans. Next, the tank will be offloaded and moved to Kennedy's Vehicle Assembly Building where it eventually will be attached to space shuttle Endeavour for the STS-134 mission to the International Space Station. STS-134, targeted to launch in Feb. 2011, currently is scheduled to be the last mission in the Space Shuttle Program. The tank, which is the largest element of the space shuttle stack, was damaged during Hurricane Katrina in August 2005 and restored to flight configuration by Lockheed Martin Space Systems Company employees. Photo credit: NASA/Frankie Martin

CAPE CANAVERAL, Fla. – At Port Canaveral, a tugboat begins to push the Pegasus barge, carrying external tank 134, through the Banana River toward the turn basin near the Vehicle Assembly Building, or VAB, at NASA's Kennedy Space Center in Florida. Pegasus arrived in Florida after an ocean voyage towed by a solid rocket booster retrieval ship from NASA's Michoud Assembly Facility near New Orleans. After Pegasus docks in the turn basin, the fuel tank will be offloaded and transported into the VAB. ET-134 will be used to launch space shuttle Endeavour on the STS-130 mission to the International Space Station. Launch is targeted for Feb. 4, 2010. For information on the components of the space shuttle and the STS-130 mission, visit http://www.nasa.gov/shuttle. Photo credit: NASA/Jack Pfaller

CAPE CANAVERAL, Fla. – External tank 134 is towed toward the open door of the transfer aisle of the Vehicle Assembly Building, or VAB, at NASA's Kennedy Space Center in Florida. The Pegasus barge, carrying the fuel tank, arrived in Florida after an ocean voyage towed by a solid rocket booster retrieval ship from NASA's Michoud Assembly Facility near New Orleans. Next, the tank will be transported into the VAB where it will be stored until needed. ET-134 will be used to launch space shuttle Endeavour on the STS-130 mission to the International Space Station. Launch is targeted for Feb. 4, 2010. For information on the components of the space shuttle and the STS-130 mission, visit http://www.nasa.gov/shuttle. Photo credit: NASA/Jack Pfaller

CAPE CANAVERAL, Fla. – The Pegasus barge, carrying external tank 134, passes through a bridge into the river near Port Canaveral. The tugboat will move the barge through the Banana River toward the turn basin near the Vehicle Assembly Building, or VAB, at NASA's Kennedy Space Center in Florida. Pegasus arrived in Florida after an ocean voyage towed by a solid rocket booster retrieval ship from NASA's Michoud Assembly Facility near New Orleans. After Pegasus docks in the turn basin, the fuel tank will be offloaded and transported into the VAB. ET-134 will be used to launch space shuttle Endeavour on the STS-130 mission to the International Space Station. Launch is targeted for Feb. 4, 2010. For information on the components of the space shuttle and the STS-130 mission, visit http://www.nasa.gov/shuttle. Photo credit: NASA/Jack Pfaller

CAPE CANAVERAL, Fla. – At Port Canaveral, a tugboat begins to move the Pegasus barge, carrying external tank 134, through the Banana River toward the turn basin near the Vehicle Assembly Building, or VAB, at NASA's Kennedy Space Center in Florida. Pegasus arrived in Florida after an ocean voyage towed by a solid rocket booster retrieval ship from NASA's Michoud Assembly Facility near New Orleans. After Pegasus docks in the turn basin, the fuel tank will be offloaded and transported into the VAB. ET-134 will be used to launch space shuttle Endeavour on the STS-130 mission to the International Space Station. Launch is targeted for Feb. 4, 2010. For information on the components of the space shuttle and the STS-130 mission, visit http://www.nasa.gov/shuttle. Photo credit: NASA/Jack Pfaller

CAPE CANAVERAL, Fla. – A bright sun and blue sky herald the passage of the Pegasus barge, carrying external tank 134, through Port Canaveral. The tugboat will move the barge through the Banana River toward the turn basin near the Vehicle Assembly Building, or VAB, at NASA's Kennedy Space Center in Florida. Pegasus arrived in Florida after an ocean voyage towed by a solid rocket booster retrieval ship from NASA's Michoud Assembly Facility near New Orleans. After Pegasus docks in the turn basin, the fuel tank will be offloaded and transported into the VAB. ET-134 will be used to launch space shuttle Endeavour on the STS-130 mission to the International Space Station. Launch is targeted for Feb. 4, 2010. For information on the components of the space shuttle and the STS-130 mission, visit http://www.nasa.gov/shuttle. Photo credit: NASA/Jack Pfaller

CAPE CANAVERAL, Fla. – Tugboats safely deliver the Pegasus barge, carrying external tank 134, to the dock in the turn basin near the Vehicle Assembly Building, or VAB, at NASA's Kennedy Space Center in Florida. Pegasus arrived in Florida after an ocean voyage towed by a solid rocket booster retrieval ship from NASA's Michoud Assembly Facility near New Orleans. After Pegasus docks in the turn basin, the fuel tank will be offloaded and transported into the VAB. ET-134 will be used to launch space shuttle Endeavour on the STS-130 mission to the International Space Station. Launch is targeted for Feb. 4, 2010. For information on the components of the space shuttle and the STS-130 mission, visit http://www.nasa.gov/shuttle. Photo credit: NASA/Jack Pfaller

CAPE CANAVERAL, Fla. – External tank 134 emerges from the Pegasus barge docked in the turn basin near the Vehicle Assembly Building, or VAB, at NASA's Kennedy Space Center in Florida. Pegasus arrived in Florida after an ocean voyage towed by a solid rocket booster retrieval ship from NASA's Michoud Assembly Facility near New Orleans. The fuel tank next will be transported into the VAB where it will be stored until needed. ET-134 will be used to launch space shuttle Endeavour on the STS-130 mission to the International Space Station. Launch is targeted for Feb. 4, 2010. For information on the components of the space shuttle and the STS-130 mission, visit http://www.nasa.gov/shuttle. Photo credit: NASA/Jack Pfaller

CAPE CANAVERAL, Fla. – Tugboats safely deliver the Pegasus barge, carrying external tank 134, to the dock in the turn basin near the Vehicle Assembly Building, or VAB, at NASA's Kennedy Space Center in Florida. Pegasus arrived in Florida after an ocean voyage towed by a solid rocket booster retrieval ship from NASA's Michoud Assembly Facility near New Orleans. After Pegasus docks in the turn basin, the fuel tank will be offloaded and transported into the VAB. ET-134 will be used to launch space shuttle Endeavour on the STS-130 mission to the International Space Station. Launch is targeted for Feb. 4, 2010. For information on the components of the space shuttle and the STS-130 mission, visit http://www.nasa.gov/shuttle. Photo credit: NASA/Jack Pfaller

CAPE CANAVERAL, Fla. -- At the Shuttle Landing Facility at NASA's Kennedy Space Center in Florida, the STS-134 crew is on hand for the arrival of the Alpha Magnetic Spectrometer, or AMS. At the microphone is Commander Mark Kelly and left to right are Mission Specialists Greg Chamitoff, Andrew Feustel, European Space Agency astronaut Roberto Vittori, Mission Specialist Michael Fincke and Pilot Gregory H. Johnson. AMS is 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. – A worker tows external tank 134 off the Pegasus barge docked in the turn basin near the Vehicle Assembly Building, or VAB, at NASA's Kennedy Space Center in Florida. Pegasus arrived in Florida after an ocean voyage towed by a solid rocket booster retrieval ship from NASA's Michoud Assembly Facility near New Orleans. After the fuel tank is offloaded, it will be transported into the VAB where it will be stored until needed. ET-134 will be used to launch space shuttle Endeavour on the STS-130 mission to the International Space Station. Launch is targeted for Feb. 4, 2010. For information on the components of the space shuttle and the STS-130 mission, visit http://www.nasa.gov/shuttle. Photo credit: NASA/Jack Pfaller

CAPE CANAVERAL, Fla. -- The Pegasus Barge carrying the Space Shuttle Program's last external fuel tank, ET-122, arrives at the Turn Basin at NASA's Kennedy Space Center in Florida. The tank traveled 900 miles by sea from NASA's Michoud Assembly Facility in New Orleans. Next, the tank will be offloaded and moved to the Vehicle Assembly Building where it eventually will be attached to space shuttle Endeavour for the STS-134 mission to the International Space Station. STS-134, targeted to launch in Feb. 2011, currently is scheduled to be the last mission in the Space Shuttle Program. The tank, which is the largest element of the space shuttle stack, was damaged during Hurricane Katrina in August 2005 and restored to flight configuration by Lockheed Martin Space Systems Company employees. Photo credit: NASA/Jack Pfaller

CAPE CANAVERAL, Fla. – Workers prepare to offload external tank 134 from the Pegasus barge docked in the turn basin near the Vehicle Assembly Building, or VAB, at NASA's Kennedy Space Center in Florida. Pegasus arrived in Florida after an ocean voyage towed by a solid rocket booster retrieval ship from NASA's Michoud Assembly Facility near New Orleans. After Pegasus docks in the turn basin, the fuel tank will be offloaded and transported into the VAB. ET-134 will be used to launch space shuttle Endeavour on the STS-130 mission to the International Space Station. Launch is targeted for Feb. 4, 2010. For information on the components of the space shuttle and the STS-130 mission, visit http://www.nasa.gov/shuttle. Photo credit: NASA/Jack Pfaller

CAPE CANAVERAL, Fla. – A tugboat moves the Pegasus barge, carrying external tank 134, through the Banana River toward the turn basin near the Vehicle Assembly Building, or VAB, at NASA's Kennedy Space Center in Florida. Space Shuttle Atlantis awaits launch on Launch Pad 39A in the background. Pegasus arrived in Florida after an ocean voyage towed by a solid rocket booster retrieval ship from NASA's Michoud Assembly Facility near New Orleans. After Pegasus docks in the turn basin, the fuel tank will be offloaded and transported into the VAB. ET-134 will be used to launch space shuttle Endeavour on the STS-130 mission to the International Space Station. Launch is targeted for Feb. 4, 2010. For information on the components of the space shuttle and the STS-130 mission, visit http://www.nasa.gov/shuttle. Photo credit: NASA/Jack Pfaller

CAPE CANAVERAL, Fla. -- After the arrival of the Alpha Magnetic Spectrometer, or AMS, at the Shuttle Landing Facility at NASA's Kennedy Space Center in Florida, Professor Sam Ting, AMS Principal Investigator from the Massachusetts Institute of Technology speaks with the media while STS-134 Commander Mark Kelly, Mission Specialists Michael Fincke and Greg Chamitoff look on. 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. -- The Pegasus Barge carrying the Space Shuttle Program's last external fuel tank, ET-122, arrives at the Turn Basin at NASA's Kennedy Space Center in Florida. The tank traveled 900 miles by sea from NASA's Michoud Assembly Facility in New Orleans. Next, the tank will be offloaded and moved to the Vehicle Assembly Building where it eventually will be attached to space shuttle Endeavour for the STS-134 mission to the International Space Station. STS-134, targeted to launch in Feb. 2011, currently is scheduled to be the last mission in the Space Shuttle Program. The tank, which is the largest element of the space shuttle stack, was damaged during Hurricane Katrina in August 2005 and restored to flight configuration by Lockheed Martin Space Systems Company employees. Photo credit: NASA/Jack Pfaller

CAPE CANAVERAL, Fla. -- NASA's Pegasus barge, carrying the Space Shuttle Program's last external fuel tank, ET-122, arrives at the Turn Basin of NASA's Kennedy Space Center in Florida. The tank traveled 900 miles by sea from NASA's Michoud Assembly Facility in New Orleans. Next, the tank will be offloaded and moved to the Vehicle Assembly Building where it eventually will be attached to space shuttle Endeavour for the STS-134 mission to the International Space Station. STS-134, targeted to launch in Feb. 2011, currently is scheduled to be the last mission in the Space Shuttle Program. The tank, which is the largest element of the space shuttle stack, was damaged during Hurricane Katrina in August 2005 and restored to flight configuration by Lockheed Martin Space Systems Company employees. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. -- NASA's Pegasus barge, carrying the Space Shuttle Program's last external fuel tank, ET-122, arrives at the Turn Basin of NASA's Kennedy Space Center in Florida. The tank traveled 900 miles by sea from NASA's Michoud Assembly Facility in New Orleans. Next, the tank will be offloaded and moved to the Vehicle Assembly Building where it eventually will be attached to space shuttle Endeavour for the STS-134 mission to the International Space Station. STS-134, targeted to launch in Feb. 2011, currently is scheduled to be the last mission in the Space Shuttle Program. The tank, which is the largest element of the space shuttle stack, was damaged during Hurricane Katrina in August 2005 and restored to flight configuration by Lockheed Martin Space Systems Company employees. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. -- At NASA's Kennedy Space Center in Florida, the Pegasus Barge, carrying the Space Shuttle Program's last external fuel tank, ET-122, arrives at the Turn Basin. The tank traveled 900 miles by sea from NASA's Michoud Assembly Facility in New Orleans. Next, the tank will be offloaded and moved to Kennedy's Vehicle Assembly Building where it eventually will be attached to space shuttle Endeavour for the STS-134 mission to the International Space Station. STS-134, targeted to launch in Feb. 2011, currently is scheduled to be the last mission in the Space Shuttle Program. The tank, which is the largest element of the space shuttle stack, was damaged during Hurricane Katrina in August 2005 and restored to flight configuration by Lockheed Martin Space Systems Company employees. Photo credit: NASA/Frankie Martin

CAPE CANAVERAL, Fla. -- NASA's Pegasus barge, which was ushered by two tug boats and Liberty Star, arrives at NASA's Kennedy Space Center in Florida. The barge is carrying the Space Shuttle Program's last external fuel tank, ET-122 and traveled 900 miles by sea from NASA's Michoud Assembly Facility in New Orleans. Next, the tank will be offloaded and moved to the Vehicle Assembly Building where it eventually will be attached to space shuttle Endeavour for the STS-134 mission to the International Space Station. STS-134, targeted to launch in Feb. 2011, currently is scheduled to be the last mission in the Space Shuttle Program. The tank, which is the largest element of the space shuttle stack, was damaged during Hurricane Katrina in August 2005 and restored to flight configuration by Lockheed Martin Space Systems Company employees. Photo credit: NASA/Jim Grossmann

CAPE CANAVERAL, Fla. – At Port Canaveral, a tugboat relieves the Liberty Star for the move of the Pegasus barge, carrying external tank 134, through the Banana River toward the turn basin near the Vehicle Assembly Building, or VAB, at NASA's Kennedy Space Center in Florida. Pegasus arrived in Florida after an ocean voyage towed by the solid rocket booster retrieval ship from NASA's Michoud Assembly Facility near New Orleans. After Pegasus docks in the turn basin, the fuel tank will be offloaded and transported into the VAB. ET-134 will be used to launch space shuttle Endeavour on the STS-130 mission to the International Space Station. Launch is targeted for Feb. 4, 2010. For information on the components of the space shuttle and the STS-130 mission, visit http://www.nasa.gov/shuttle. Photo credit: NASA/Jack Pfaller

CAPE CANAVERAL, Fla. -- The Pegasus Barge carrying the Space Shuttle Program's last external fuel tank, ET-122, arrives at the Turn Basin at NASA's Kennedy Space Center in Florida. The tank traveled 900 miles by sea from NASA's Michoud Assembly Facility in New Orleans. Next, the tank will be offloaded and moved to the Vehicle Assembly Building where it eventually will be attached to space shuttle Endeavour for the STS-134 mission to the International Space Station. STS-134, targeted to launch in Feb. 2011, currently is scheduled to be the last mission in the Space Shuttle Program. The tank, which is the largest element of the space shuttle stack, was damaged during Hurricane Katrina in August 2005 and restored to flight configuration by Lockheed Martin Space Systems Company employees. Photo credit: NASA/Jack Pfaller

CAPE CANAVERAL, Fla. – External tank 134 is towed toward the looming 525-foot-tall Vehicle Assembly Building, or VAB, at NASA's Kennedy Space Center in Florida. The Pegasus barge, carrying the fuel tank, arrived in Florida after an ocean voyage towed by a solid rocket booster retrieval ship from NASA's Michoud Assembly Facility near New Orleans. Next, the tank will be transported into the VAB where it will be stored until needed. ET-134 will be used to launch space shuttle Endeavour on the STS-130 mission to the International Space Station. Launch is targeted for Feb. 4, 2010. For information on the components of the space shuttle and the STS-130 mission, visit http://www.nasa.gov/shuttle. Photo credit: NASA/Jack Pfaller

CAPE CANAVERAL, Fla. – Tugboats safely deliver the Pegasus barge, carrying external tank 134, to the dock in the turn basin near the Vehicle Assembly Building, or VAB, at NASA's Kennedy Space Center in Florida. Pegasus arrived in Florida after an ocean voyage towed by a solid rocket booster retrieval ship from NASA's Michoud Assembly Facility near New Orleans. After Pegasus docks in the turn basin, the fuel tank will be offloaded and transported into the VAB. ET-134 will be used to launch space shuttle Endeavour on the STS-130 mission to the International Space Station. Launch is targeted for Feb. 4, 2010. For information on the components of the space shuttle and the STS-130 mission, visit http://www.nasa.gov/shuttle. Photo credit: NASA/Jack Pfaller

CAPE CANAVERAL, Fla. -- At the Shuttle Landing Facility at NASA's Kennedy Space Center in Florida, STS-134 European Space Agency astronaut Roberto Vittori is accompanied by Pilot Gregory H. Johnson and Commander Mark Kelly on the tarmac where the C-5M aircraft is parked after 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. -- Viewed from across the turn basin in the Launch Complex 39 area at NASA's Kennedy Space Center in Florida, External Tank-138 is being offloaded from the Pegasus barge near the Vehicle Assembly Building. The external fuel tank arrived in Florida on July 13, from NASA's Michoud Assembly Facility near New Orleans. ET-138, the last newly manufactured tank, was originally designated to fly on Endeavour's STS-134 mission to the International Space Station, but later reassigned to fly on space shuttle Atlantis' final mission, STS-135. For information, visit www.nasa.gov_shuttle. Photo credit: NASA_Jim Grossmann

CAPE CANAVERAL, Fla. -- At NASA's Kennedy Space Center in Florida, workers prepare External Tank-138 for offload from the Pegasus barge docked in the turn basin near the Vehicle Assembly Building. The external fuel tank arrived in Florida on July 13, from NASA's Michoud Assembly Facility near New Orleans. ET-138, the last newly manufactured tank, was originally designated to fly on Endeavour's STS-134 mission to the International Space Station, but later reassigned to fly on space shuttle Atlantis' final mission, STS-135. For information, visit www.nasa.gov_shuttle. Photo credit: NASA_Jack Pfaller

CAPE CANAVERAL, Fla. -- At NASA's Kennedy Space Center in Florida, preparations are under way to offload External Tank-138 from the Pegasus barge docked in the turn basin near the Vehicle Assembly Building. The external fuel tank arrived in Florida on July 13, from NASA's Michoud Assembly Facility near New Orleans. ET-138, the last newly manufactured tank, was originally designated to fly on Endeavour's STS-134 mission to the International Space Station, but later reassigned to fly on space shuttle Atlantis' final mission, STS-135. For information, visit www.nasa.gov_shuttle. Photo credit: NASA_Jim Grossmann