CAPE CANAVERAL, Fla. -- In Orbiter Processing Facility-2 at NASA's Kennedy Space Center in Florida, thermal protection system technicians work on replacing some of space shuttle Endeavour's heat shield tiles. As the final planned mission of the Space Shuttle Program, Endeavour and its crew will deliver the Alpha Magnetic Spectrometer, as well as critical spare components to the station on the STS-134 mission targeted for launch Feb. 26, 2011. For more information visit, http://www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts134/index.html. Photo credit: NASA/Frankie Martin

CAPE CANAVERAL, Fla. -- A panoramic view of Orbiter Processing Facility-2 at NASA's Kennedy Space Center in Florida, showing the nose section of space shuttle Endeavour peaking through the scaffolding. As the final planned mission of the Space Shuttle Program, Endeavour and its crew will deliver the Alpha Magnetic Spectrometer, as well as critical spare components to the station on the STS-134 mission targeted for launch Feb. 26, 2011. For more information visit, http://www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts134/index.html. Photo credit: NASA/Frankie Martin

CAPE CANAVERAL, Fla. -- Signs in Orbiter Processing Facility-2 at NASA's Kennedy Space Center in Florida, reflect the pride and dedication workers have for space shuttle Endeavour and the Space Shuttle Program. As the final planned mission of the Space Shuttle Program, Endeavour and its crew will deliver the Alpha Magnetic Spectrometer, as well as critical spare components to the station on the STS-134 mission targeted for launch Feb. 26, 2011. For more information visit, http://www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts134/index.html. Photo credit: NASA/Frankie Martin

CAPE CANAVERAL, Fla. -- In Orbiter Processing Facility-2 at NASA's Kennedy Space Center in Florida, a thermal protection system technician points to an area on space shuttle Endeavour's underside that may require tile replacement. As the final planned mission of the Space Shuttle Program, Endeavour and its crew will deliver the Alpha Magnetic Spectrometer, as well as critical spare components to the station on the STS-134 mission targeted for launch Feb. 26, 2011. 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 Orbiter Processing Facility-2 at NASA's Kennedy Space Center in Florida, STS-134 Mission Specialist Greg Chamitoff looks at space shuttle Endeavour's heat shield tiles, which will protect the spacecraft during re-entry. The six STS-134 astronauts are at Kennedy participating in the Crew Equipment Interface Test (CEIT), which gives them an opportunity for hands-on training and familiarization of the payload they'll be delivering to the International Space Station. Space shuttle Endeavour is targeted to launch on the STS-134 mission Feb. 27, 2011. For more information, visit www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts134/index.html. Photo credit: NASA/Cory Huston

CAPE CANAVERAL, Fla. -- In the Orbiter Processing Facility-2 at NASA's Kennedy Space Center in Florida, STS-134 Mission Specialists Andrew Feustel, left, Michael Finke and Greg Chamitoff look at space shuttle Endeavour's heat shield tiles, which will protect the spacecraft during re-entry. The six STS-134 astronauts are at Kennedy participating in the Crew Equipment Interface Test (CEIT), which gives them an opportunity for hands-on training and familiarization of the payload they'll be delivering to the International Space Station. Space shuttle Endeavour is targeted to launch on the STS-134 mission Feb. 27, 2011. For more information, visit www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts134/index.html. Photo credit: NASA/Cory Huston

CAPE CANAVERAL, Fla. -- In the Orbiter Processing Facility-2 at NASA's Kennedy Space Center in Florida, STS-134 Mission Specialists Michael Finke, left, Gregory Chamitoff and Andrew Feustel check out the heat shield tiles that protect space shuttles during re-entry. The six STS-134 astronauts are at Kennedy participating in the Crew Equipment Interface Test (CEIT), which gives them an opportunity for hands-on training with the tools and equipment they'll use in space and familiarization of the payload they'll be delivering to the International Space Station. Space shuttle Endeavour is targeted to launch on the STS-134 mission Feb. 27, 2011. For more information, visit www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts134/index.html. Photo credit: NASA/Cory Huston

CAPE CANAVERAL, Fla. -- In the Orbiter Processing Facility-2 at NASA's Kennedy Space Center in Florida, the STS-134 crew checks out the heat shield tiles that protect space shuttles during re-entry. From left, are Mission Specialists Greg Chamitoff and Andrew Feustel, Pilot Gregory H. Johnson, Commander Mark Kelly and Mission Specialist Roberto Vittori of the European Space Agency. The six STS-134 astronauts are at Kennedy participating in the Crew Equipment Interface Test (CEIT), which gives them an opportunity for hands-on training with the tools and equipment they'll use in space and familiarization of the payload they'll be delivering to the International Space Station. Space shuttle Endeavour is targeted to launch on the STS-134 mission Feb. 27, 2011. For more information, visit www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts134/index.html. Photo credit: NASA/Cory Huston

CAPE CANAVERAL, Fla. -- In the Orbiter Processing Facility-2 at NASA's Kennedy Space Center in Florida, STS-134 Commander Mark Kelly, left, and Mission Specialist Roberto Vittori with the European Space Agency check out the heat shield tiles that protect space shuttles during re-entry. The six STS-134 astronauts are at Kennedy participating in the Crew Equipment Interface Test (CEIT), which gives them an opportunity for hands-on training with the tools and equipment they'll use in space and familiarization of the payload they'll be delivering to the International Space Station. Space shuttle Endeavour is targeted to launch on the STS-134 mission Feb. 27, 2011. For more information, visit www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts134/index.html. Photo credit: NASA/Cory Huston

CAPE CANAVERAL, Fla. -- Managers check out the heat shield tiles that protected space shuttle Endeavour on its successful trip home to the Shuttle Landing Facility's Runway 15 at NASA's Kennedy Space Center in Florida. Endeavour's final return from space completed the 16-day, 6.5-million-mile STS-134 mission. Main gear touchdown was at 2:34:51 a.m. EDT, followed by nose gear touchdown at 2:35:04 a.m., and wheelstop at 2:35:36 a.m. STS-134 delivered the Alpha Magnetic Spectrometer-2 (AMS) and the Express Logistics Carrier-3 (ELC-3) to the International Space Station. AMS will help researchers understand the origin of the universe and search for evidence of dark matter, strange matter and antimatter from the station. ELC-3 carried spare parts that will sustain station operations once the shuttles are retired from service. STS-134 was the 25th and final flight for Endeavour, which spent 299 days in space, orbited Earth 4,671 times and traveled 122,883,151 miles. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. -- European Space Agency Director of Human Spaceflight Thomas Reiter, left, Associate Administrator for Space Operations Bill Gerstenmaier, and NASA Kennedy Space Center Director Bob Cabana check out a heat shield tile that protected space shuttle Endeavour on its successful trip home. Endeavour's final return from space completed the 16-day, 6.5-million-mile STS-134 mission. Main gear touchdown on the Shuttle Landing Facility's Runway 15 was at 2:34:51 a.m. EDT, followed by nose gear touchdown at 2:35:04 a.m., and wheelstop at 2:35:36 a.m. STS-134 delivered the Alpha Magnetic Spectrometer-2 (AMS) and the Express Logistics Carrier-3 (ELC-3) to the International Space Station. AMS will help researchers understand the origin of the universe and search for evidence of dark matter, strange matter and antimatter from the station. ELC-3 carried spare parts that will sustain station operations once the shuttles are retired from service. STS-134 was the 25th and final flight for Endeavour, which spent 299 days in space, orbited Earth 4,671 times and traveled 122,883,151 miles. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. --- At NASA's Kennedy Space Center in Florida, the Class of 2009 Astronaut Candidates, also called ASCANs, check out heat shield tiles in Orbiter Processing Facility-1. Inside the facility, shuttle Atlantis is being prepared for the 'launch on need,' or potential rescue mission for the final scheduled shuttle flight, Endeavour's STS-134 mission. Sarah Schilling, Atlantis' processing engineer, right, was on hand to answer questions about the vehicle. The new astronaut candidates for NASA are Serena M. Aunon, Jeanette J. Epps, Air Force Maj. Jack D. Fischer, Air Force Lt. Col. Michael S. Hopkins, Kjell N. Lindgren, Kathleen 'Kate' Rubins, Navy Cmdr. Scott D. Tingle, Army Lt. Col. Mark T. Vande, and Navy Lt. Cmdr. Gregory R. 'Reid' Wiseman. The new astronaut candidates for the Japan Aerospace Exploration Agency, or JAXA, are Norishige Kanai, Takuya Onishi and Kimiya Yui. The new astronaut candidates for the Canadian Space Agency, or CSA, are Jeremy Hansen and David Saint-Jacques. Photo Credit: NASA_Kim Shiflett

CAPE CANAVERAL, Fla. --- At NASA's Kennedy Space Center in Florida, the Class of 2009 Astronaut Candidates, also called ASCANs, check out heat shield tiles in Orbiter Processing Facility-1. Inside the facility, space shuttle Atlantis is being processed for the 'launch on need,' or potential rescue mission for the final scheduled shuttle flight, Endeavour's STS-134 mission. The new astronaut candidates for NASA are Serena M. Aunon, Jeanette J. Epps, Air Force Maj. Jack D. Fischer, Air Force Lt. Col. Michael S. Hopkins, Kjell N. Lindgren, Kathleen 'Kate' Rubins, Navy Cmdr. Scott D. Tingle, Army Lt. Col. Mark T. Vande, and Navy Lt. Cmdr. Gregory R. 'Reid' Wiseman. The new astronaut candidates for the Japan Aerospace Exploration Agency, or JAXA, are Norishige Kanai, Takuya Onishi and Kimiya Yui. The new astronaut candidates for the Canadian Space Agency, or CSA, are Jeremy Hansen and David Saint-Jacques. Photo Credit: NASA_Kim Shiflett

CAPE CANAVERAL, Fla. --- At NASA's Kennedy Space Center in Florida, the Class of 2009 Astronaut Candidates, also called ASCANs, check out heat shield tiles in Orbiter Processing Facility-1. Inside the facility, space shuttle Atlantis is being processed for the 'launch on need,' or potential rescue mission for the final scheduled shuttle flight, Endeavour's STS-134 mission. The new astronaut candidates for NASA are Serena M. Aunon, Jeanette J. Epps, Air Force Maj. Jack D. Fischer, Air Force Lt. Col. Michael S. Hopkins, Kjell N. Lindgren, Kathleen 'Kate' Rubins, Navy Cmdr. Scott D. Tingle, Army Lt. Col. Mark T. Vande, and Navy Lt. Cmdr. Gregory R. 'Reid' Wiseman. The new astronaut candidates for the Japan Aerospace Exploration Agency, or JAXA, are Norishige Kanai, Takuya Onishi and Kimiya Yui. The new astronaut candidates for the Canadian Space Agency, or CSA, are Jeremy Hansen and David Saint-Jacques. Photo Credit: NASA_Kim Shiflett