
CAPE CANAVERAL, Fla. -- Xenon lights positioned at the end of Runway 15 spotlight space shuttle Atlantis as it nears touchdown for the last time at NASA's Kennedy Space Center in Florida. Securing the space shuttle fleet's place in history, Atlantis marked the 26th nighttime landing of NASA's Space Shuttle Program and the 78th landing at Kennedy. Main gear touchdown was at 5:57:00 a.m. EDT, followed by nose gear touchdown at 5:57:20 a.m., and wheelstop at 5:57:54 a.m. On board are STS-135 Commander Chris Ferguson, Pilot Doug Hurley, and Mission Specialists Sandy Magnus and Rex Walheim. On the 37th shuttle mission to the International Space Station, STS-135 delivered the Raffaello multi-purpose logistics module filled with more than 9,400 pounds of spare parts, equipment and supplies that will sustain station operations for the next year. STS-135 was the 33rd and final flight for Atlantis, which has spent 307 days in space, orbited Earth 4,848 times and traveled 125,935,769 miles. STS-135 also was the final mission of the Space Shuttle Program. For more information, visit www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts135/index.html. Photo credit: NASA/Tom Farrar and Tony Gray

CAPE CANAVERAL, Fla. -- Xenon lights positioned at the end of Runway 15 reveal that the drag chute has deployed behind space shuttle Atlantis to slow the shuttle as it lands for the last time at the Shuttle Landing Facility at NASA's Kennedy Space Center in Florida. Securing the space shuttle fleet's place in history, Atlantis marked the 26th nighttime landing of NASA's Space Shuttle Program and the 78th landing at Kennedy. Main gear touchdown was at 5:57:00 a.m. EDT, followed by nose gear touchdown at 5:57:20 a.m., and wheelstop at 5:57:54 a.m. On board are STS-135 Commander Chris Ferguson, Pilot Doug Hurley, and Mission Specialists Sandy Magnus and Rex Walheim. On the 37th shuttle mission to the International Space Station, STS-135 delivered the Raffaello multi-purpose logistics module filled with more than 9,400 pounds of spare parts, equipment and supplies that will sustain station operations for the next year. STS-135 was the 33rd and final flight for Atlantis, which has spent 307 days in space, orbited Earth 4,848 times and traveled 125,935,769 miles. STS-135 also was the final mission of the Space Shuttle Program. For more information, visit www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts135/index.html. Photo credit: NASA/Tom Farrar and Tony Gray

CAPE CANAVERAL, Fla. -- At NASA's Kennedy Space Center in Florida, xenon lights positioned at the end of Runway 15 illuminate the Shuttle Landing Facility for space shuttle Atlantis' final return from space. Securing the space shuttle fleet's place in history, Atlantis marked the 26th nighttime landing of NASA's Space Shuttle Program and the 78th landing at Kennedy. Main gear touchdown was at 5:57:00 a.m. EDT, followed by nose gear touchdown at 5:57:20 a.m., and wheelstop at 5:57:54 a.m. On board are STS-135 Commander Chris Ferguson, Pilot Doug Hurley, and Mission Specialists Sandy Magnus and Rex Walheim. On the 37th shuttle mission to the International Space Station, STS-135 delivered the Raffaello multi-purpose logistics module filled with more than 9,400 pounds of spare parts, equipment and supplies that will sustain station operations for the next year. STS-135 was the 33rd and final flight for Atlantis, which has spent 307 days in space, orbited Earth 4,848 times and traveled 125,935,769 miles. STS-135 also was the final mission of the Space Shuttle Program. For more information, visit www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts135/index.html. Photo credit: NASA/Tom Farrar and Tony Gray

CAPE CANAVERAL, Fla. -- Xenon lights positioned at the end of Runway 15 spotlight space shuttle Atlantis as it nears touchdown for the last time at NASA's Kennedy Space Center in Florida. Securing the space shuttle fleet's place in history, Atlantis marked the 26th nighttime landing of NASA's Space Shuttle Program and the 78th landing at Kennedy. Main gear touchdown was at 5:57:00 a.m. EDT, followed by nose gear touchdown at 5:57:20 a.m., and wheelstop at 5:57:54 a.m. On board are STS-135 Commander Chris Ferguson, Pilot Doug Hurley, and Mission Specialists Sandy Magnus and Rex Walheim. On the 37th shuttle mission to the International Space Station, STS-135 delivered the Raffaello multi-purpose logistics module filled with more than 9,400 pounds of spare parts, equipment and supplies that will sustain station operations for the next year. STS-135 was the 33rd and final flight for Atlantis, which has spent 307 days in space, orbited Earth 4,848 times and traveled 125,935,769 miles. STS-135 also was the final mission of the Space Shuttle Program. For more information, visit www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts135/index.html. Photo credit: NASA/Tom Farrar and Tony Gray

CAPE CANAVERAL, Fla. -- Vapor trails follow space shuttle Atlantis as it touches down on Runway 15 on the Shuttle Landing Facility at NASA's Kennedy Space Center in Florida for the final time. A vapor trail, known as a contrail, is a cloud of water vapor that condenses and freezes around the small particles in aircraft exhaust. Atlantis marked the 26th nighttime landing of NASA's Space Shuttle Program and the 78th landing at Kennedy. It also was the final mission for the shuttle program. STS-135 was the 33rd and final flight for Atlantis, which has spent 307 days in space, orbited Earth 4,848 times and traveled 125,935,769 miles. For more information on the space shuttle era, visit www.nasa.gov/mission_pages/shuttle/flyout. Photo credit: NASA/Sandra Joseph and Kevin O'Connell

CAPE CANAVERAL, Fla. -- Space shuttle Atlantis moves out of its xenon spotlights and into the history books as it lands on Runway 15 at the Shuttle Landing Facility at NASA's Kennedy Space Center in Florida. Atlantis marked the 26th nighttime landing of NASA's Space Shuttle Program and the 78th landing at Kennedy. Main gear touchdown was at 5:57:00 a.m. EDT, followed by nose gear touchdown at 5:57:20 a.m., and wheelstop at 5:57:54 a.m. On board are STS-135 Commander Chris Ferguson, Pilot Doug Hurley, and Mission Specialists Sandy Magnus and Rex Walheim. On the 37th shuttle mission to the International Space Station, STS-135 delivered the Raffaello multi-purpose logistics module filled with more than 9,400 pounds of spare parts, equipment and supplies that will sustain station operations for the next year. STS-135 was the 33rd and final flight for Atlantis, which has spent 307 days in space, orbited Earth 4,848 times and traveled 125,935,769 miles. STS-135 also was the final mission of the Space Shuttle Program. For more information, visit www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts135/index.html. Photo credit: NASA/Tom Farrar and Tony Gray

CAPE CANAVERAL, Fla. -- Space shuttle Atlantis begins to disappear into the darkness as it rolls to a stop on Runway 15 on the Shuttle Landing Facility at NASA's Kennedy Space Center in Florida for the final time. Atlantis marked the 26th nighttime landing of NASA's Space Shuttle Program and the 78th landing at Kennedy. It also was the final mission for the shuttle program. STS-135 was the 33rd and final flight for Atlantis, which has spent 307 days in space, orbited Earth 4,848 times and traveled 125,935,769 miles. For more information on the space shuttle era, visit www.nasa.gov/mission_pages/shuttle/flyout. Photo credit: NASA/Sandra Joseph and Kevin O'Connell

CAPE CANAVERAL, Fla. -- Xenon lights positioned at the end of Runway 15 spotlight space shuttle Atlantis as it nears touchdown for the last time at NASA's Kennedy Space Center in Florida. Securing the space shuttle fleet's place in history, Atlantis marked the 26th nighttime landing of NASA's Space Shuttle Program and the 78th landing at Kennedy. Main gear touchdown was at 5:57:00 a.m. EDT, followed by nose gear touchdown at 5:57:20 a.m., and wheelstop at 5:57:54 a.m. On board are STS-135 Commander Chris Ferguson, Pilot Doug Hurley, and Mission Specialists Sandy Magnus and Rex Walheim. On the 37th shuttle mission to the International Space Station, STS-135 delivered the Raffaello multi-purpose logistics module filled with more than 9,400 pounds of spare parts, equipment and supplies that will sustain station operations for the next year. STS-135 was the 33rd and final flight for Atlantis, which has spent 307 days in space, orbited Earth 4,848 times and traveled 125,935,769 miles. STS-135 also was the final mission of the Space Shuttle Program. For more information, visit www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts135/index.html. Photo credit: NASA/Tom Farrar and Tony Gray

CAPE CANAVERAL, Fla. -- Vapor trails follow space shuttle Atlantis as it approaches Runway 15 on the Shuttle Landing Facility at NASA's Kennedy Space Center in Florida for the final time. A vapor trail, known as a contrail, is a cloud of water vapor that condenses and freezes around the small particles in aircraft exhaust. Atlantis marked the 26th nighttime landing of NASA's Space Shuttle Program and the 78th landing at Kennedy. It also was the final mission for the shuttle program. STS-135 was the 33rd and final flight for Atlantis, which has spent 307 days in space, orbited Earth 4,848 times and traveled 125,935,769 miles. For more information on the space shuttle era, visit www.nasa.gov/mission_pages/shuttle/flyout. Photo credit: NASA/Sandra Joseph and Kevin O'Connell

CAPE CANAVERAL, Fla. -- Vapor trails follow space shuttle Atlantis as it approaches Runway 15 on the Shuttle Landing Facility at NASA's Kennedy Space Center in Florida for the final time. A vapor trail, known as a contrail, is a cloud of water vapor that condenses and freezes around the small particles in aircraft exhaust. Atlantis marked the 26th nighttime landing of NASA's Space Shuttle Program and the 78th landing at Kennedy. It also was the final mission for the shuttle program. STS-135 was the 33rd and final flight for Atlantis, which has spent 307 days in space, orbited Earth 4,848 times and traveled 125,935,769 miles. For more information on the space shuttle era, visit www.nasa.gov/mission_pages/shuttle/flyout. Photo credit: NASA/Sandra Joseph and Kevin O'Connell

CAPE CANAVERAL, Fla. -- Only space shuttle Atlantis' drag chute is visible as the spacecraft disappears into the darkness and rolls to a stop on Runway 15 on the Shuttle Landing Facility at NASA's Kennedy Space Center in Florida for the final time. Atlantis marked the 26th nighttime landing of NASA's Space Shuttle Program and the 78th landing at Kennedy. It also was the final mission for the shuttle program. STS-135 was the 33rd and final flight for Atlantis, which has spent 307 days in space, orbited Earth 4,848 times and traveled 125,935,769 miles. For more information on the space shuttle era, visit www.nasa.gov/mission_pages/shuttle/flyout. Photo credit: NASA/Sandra Joseph and Kevin O'Connell

CAPE CANAVERAL, Fla. -- In the Flight Vehicle Support Building at NASA Kennedy Space Center's Shuttle Landing Facility (SLF), Mission Convoy Commander Tim Obrien strategies with NASA managers and convoy crew members during a prelanding meeting. A Convoy Command Center vehicle will be positioned near shuttle Atlantis on the SLF. The command vehicle is equipped to control critical communications between the crew still aboard Atlantis and the Launch Control Center. The team will monitor the health of the orbiter systems and direct convoy operations made up of about 40 vehicles, including 25 specially designed vehicles to assist the crew in leaving the shuttle, and prepare the vehicle for towing from the SLF to its processing hangar. Securing the space shuttle fleet's place in history, Atlantis will mark the 26th nighttime landing of NASA's Space Shuttle Program and the 78th landing at Kennedy. Atlantis and its crew delivered to the International Space Station the Raffaello multi-purpose logistics module packed with more than 9,400 pounds of spare parts, equipment and supplies that will sustain station operations for the next year. STS-135 is the 33rd and final flight for Atlantis and final mission of the Space Shuttle Program. For more information, visit www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts135/index.html. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. -- A NASA Fire Rescue truck, which is part of the landing convoy at NASA's Kennedy Space Center in Florida, heads out toward space shuttle Atlantis after it rolled to a stop on the Shuttle Landing Facility's Runway for the final time. Atlantis marked the 26th nighttime landing of NASA's Space Shuttle Program and the 78th landing at Kennedy. It also was the final mission for the shuttle program. STS-135 was the 33rd and final flight for Atlantis, which has spent 307 days in space, orbited Earth 4,848 times and traveled 125,935,769 miles. For more information on the space shuttle era, visit www.nasa.gov/mission_pages/shuttle/flyout. Photo credit: NASA/Sandra Joseph and Kevin O'Connell

CAPE CANAVERAL, Fla. -- Space shuttle Atlantis disappears into the darkness as it rolls to a stop on Runway 15 on the Shuttle Landing Facility at NASA's Kennedy Space Center in Florida for the final time. Atlantis marked the 26th nighttime landing of NASA's Space Shuttle Program and the 78th landing at Kennedy. It also was the final mission for the shuttle program. STS-135 was the 33rd and final flight for Atlantis, which has spent 307 days in space, orbited Earth 4,848 times and traveled 125,935,769 miles. For more information on the space shuttle era, visit www.nasa.gov/mission_pages/shuttle/flyout. Photo credit: NASA/Sandra Joseph and Kevin O'Connell

CAPE CANAVERAL, Fla. -- Vapor trails follow space shuttle Atlantis as it approaches Runway 15 on the Shuttle Landing Facility at NASA's Kennedy Space Center in Florida for the final time. A vapor trail, known as a contrail, is a cloud of water vapor that condenses and freezes around the small particles in aircraft exhaust. Atlantis marked the 26th nighttime landing of NASA's Space Shuttle Program and the 78th landing at Kennedy. It also was the final mission for the shuttle program. STS-135 was the 33rd and final flight for Atlantis, which has spent 307 days in space, orbited Earth 4,848 times and traveled 125,935,769 miles. For more information on the space shuttle era, visit www.nasa.gov/mission_pages/shuttle/flyout. Photo credit: NASA/Sandra Joseph and Kevin O'Connell

CAPE CANAVERAL, Fla. -- Xenon lights positioned at the end of Runway 15 reveal that the drag chute has deployed behind space shuttle Atlantis to slow the shuttle as it lands for the last time at the Shuttle Landing Facility at NASA's Kennedy Space Center in Florida. Securing the space shuttle fleet's place in history, Atlantis marked the 26th nighttime landing of NASA's Space Shuttle Program and the 78th landing at Kennedy. Main gear touchdown was at 5:57:00 a.m. EDT, followed by nose gear touchdown at 5:57:20 a.m., and wheelstop at 5:57:54 a.m. On board are STS-135 Commander Chris Ferguson, Pilot Doug Hurley, and Mission Specialists Sandy Magnus and Rex Walheim. On the 37th shuttle mission to the International Space Station, STS-135 delivered the Raffaello multi-purpose logistics module filled with more than 9,400 pounds of spare parts, equipment and supplies that will sustain station operations for the next year. STS-135 was the 33rd and final flight for Atlantis, which has spent 307 days in space, orbited Earth 4,848 times and traveled 125,935,769 miles. STS-135 also was the final mission of the Space Shuttle Program. For more information, visit www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts135/index.html. Photo credit: NASA/Tom Farrar and Tony Gray

CAPE CANAVERAL, Fla. -- Vapor trails follow space shuttle Atlantis as it approaches Runway 15 on the Shuttle Landing Facility at NASA's Kennedy Space Center in Florida for the final time. A vapor trail, known as a contrail, is a cloud of water vapor that condenses and freezes around the small particles in aircraft exhaust. Atlantis marked the 26th nighttime landing of NASA's Space Shuttle Program and the 78th landing at Kennedy. It also was the final mission for the shuttle program. STS-135 was the 33rd and final flight for Atlantis, which has spent 307 days in space, orbited Earth 4,848 times and traveled 125,935,769 miles. For more information on the space shuttle era, visit www.nasa.gov/mission_pages/shuttle/flyout. Photo credit: NASA/Sandra Joseph and Kevin O'Connell

CAPE CANAVERAL, Fla. -- Space shuttle Atlantis moves out of its xenon spotlights and into the history books as it lands on Runway 15 at the Shuttle Landing Facility at NASA's Kennedy Space Center in Florida. Atlantis marked the 26th nighttime landing of NASA's Space Shuttle Program and the 78th landing at Kennedy. Main gear touchdown was at 5:57:00 a.m. EDT, followed by nose gear touchdown at 5:57:20 a.m., and wheelstop at 5:57:54 a.m. On board are STS-135 Commander Chris Ferguson, Pilot Doug Hurley, and Mission Specialists Sandy Magnus and Rex Walheim. On the 37th shuttle mission to the International Space Station, STS-135 delivered the Raffaello multi-purpose logistics module filled with more than 9,400 pounds of spare parts, equipment and supplies that will sustain station operations for the next year. STS-135 was the 33rd and final flight for Atlantis, which has spent 307 days in space, orbited Earth 4,848 times and traveled 125,935,769 miles. STS-135 also was the final mission of the Space Shuttle Program. For more information, visit www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts135/index.html. Photo credit: NASA/Tom Farrar and Tony Gray

CAPE CANAVERAL, Fla. -- At NASA's Kennedy Space Center in Florida, xenon lights positioned at the end of Runway 15 illuminate the Shuttle Landing Facility for space shuttle Atlantis' final return from space. Securing the space shuttle fleet's place in history, Atlantis marked the 26th nighttime landing of NASA's Space Shuttle Program and the 78th landing at Kennedy. Main gear touchdown was at 5:57:00 a.m. EDT, followed by nose gear touchdown at 5:57:20 a.m., and wheelstop at 5:57:54 a.m. On board are STS-135 Commander Chris Ferguson, Pilot Doug Hurley, and Mission Specialists Sandy Magnus and Rex Walheim. On the 37th shuttle mission to the International Space Station, STS-135 delivered the Raffaello multi-purpose logistics module filled with more than 9,400 pounds of spare parts, equipment and supplies that will sustain station operations for the next year. STS-135 was the 33rd and final flight for Atlantis, which has spent 307 days in space, orbited Earth 4,848 times and traveled 125,935,769 miles. STS-135 also was the final mission of the Space Shuttle Program. For more information, visit www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts135/index.html. Photo credit: NASA/Tom Farrar and Tony Gray

CAPE CANAVERAL, Fla. -- Space shuttle Atlantis rolls out of its xenon spotlights and into the history books as it lands on Runway 15 at the Shuttle Landing Facility at NASA's Kennedy Space Center in Florida. Atlantis marked the 26th nighttime landing of NASA's Space Shuttle Program and the 78th landing at Kennedy. Main gear touchdown was at 5:57:00 a.m. EDT, followed by nose gear touchdown at 5:57:20 a.m., and wheelstop at 5:57:54 a.m. On board are STS-135 Commander Chris Ferguson, Pilot Doug Hurley, and Mission Specialists Sandy Magnus and Rex Walheim. On the 37th shuttle mission to the International Space Station, STS-135 delivered the Raffaello multi-purpose logistics module filled with more than 9,400 pounds of spare parts, equipment and supplies that will sustain station operations for the next year. STS-135 was the 33rd and final flight for Atlantis, which has spent 307 days in space, orbited Earth 4,848 times and traveled 125,935,769 miles. STS-135 also was the final mission of the Space Shuttle Program. For more information, visit www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts135/index.html. Photo credit: NASA/Tom Farrar and Tony Gray

CAPE CANAVERAL, Fla. -- Vapor trails follow space shuttle Atlantis as it touches down on Runway 15 on the Shuttle Landing Facility at NASA's Kennedy Space Center in Florida for the final time. A vapor trail, known as a contrail, is a cloud of water vapor that condenses and freezes around the small particles in aircraft exhaust. Atlantis marked the 26th nighttime landing of NASA's Space Shuttle Program and the 78th landing at Kennedy. It also was the final mission for the shuttle program. STS-135 was the 33rd and final flight for Atlantis, which has spent 307 days in space, orbited Earth 4,848 times and traveled 125,935,769 miles. For more information on the space shuttle era, visit www.nasa.gov/mission_pages/shuttle/flyout. Photo credit: NASA/Sandra Joseph and Kevin O'Connell

CAPE CANAVERAL, Fla. -- Space shuttle Atlantis disappears into the darkness as it rolls to a stop on Runway 15 on the Shuttle Landing Facility at NASA's Kennedy Space Center in Florida for the final time. Atlantis marked the 26th nighttime landing of NASA's Space Shuttle Program and the 78th landing at Kennedy. It also was the final mission for the shuttle program. STS-135 was the 33rd and final flight for Atlantis, which has spent 307 days in space, orbited Earth 4,848 times and traveled 125,935,769 miles. For more information on the space shuttle era, visit www.nasa.gov/mission_pages/shuttle/flyout. Photo credit: NASA/Sandra Joseph and Kevin O'Connell

CAPE CANAVERAL, Fla. -- Space shuttle Atlantis begins to disappear into the darkness as it rolls to a stop on Runway 15 on the Shuttle Landing Facility at NASA's Kennedy Space Center in Florida for the final time. Atlantis marked the 26th nighttime landing of NASA's Space Shuttle Program and the 78th landing at Kennedy. It also was the final mission for the shuttle program. STS-135 was the 33rd and final flight for Atlantis, which has spent 307 days in space, orbited Earth 4,848 times and traveled 125,935,769 miles. For more information on the space shuttle era, visit www.nasa.gov/mission_pages/shuttle/flyout. Photo credit: NASA/Sandra Joseph and Kevin O'Connell

CAPE CANAVERAL, Fla. -- Landing convoy vehicles surround space shuttle Atlantis following its touchdown on Runway 15 at the Shuttle Landing Facility at NASA's Kennedy Space Center in Florida. The employees assigned to the convoy team prepare to safe the spacecraft before it is towed to Orbiter Processing Facility-2 for decommissioning. Atlantis marked the 26th nighttime landing of NASA's Space Shuttle Program and the 78th landing at Kennedy. Main gear touchdown was at 5:57:00 a.m. EDT, followed by nose gear touchdown at 5:57:20 a.m., and wheelstop at 5:57:54 a.m. On board are STS-135 Commander Chris Ferguson, Pilot Doug Hurley, and Mission Specialists Sandy Magnus and Rex Walheim. On the 37th shuttle mission to the International Space Station, STS-135 delivered the Raffaello multi-purpose logistics module filled with more than 9,400 pounds of spare parts, equipment and supplies that will sustain station operations for the next year. STS-135 was the 33rd and final flight for Atlantis, which has spent 307 days in space, orbited Earth 4,848 times and traveled 125,935,769 miles. STS-135 also was the final mission of the Space Shuttle Program. For more information, visit www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts135/index.html. Photo credit: NASA/Tom Farrar and Tony Gray

CAPE CANAVERAL, Fla. -- Space shuttle Atlantis rolls out of its xenon spotlights and into the history books as it lands on Runway 15 at the Shuttle Landing Facility at NASA's Kennedy Space Center in Florida. Atlantis marked the 26th nighttime landing of NASA's Space Shuttle Program and the 78th landing at Kennedy. Main gear touchdown was at 5:57:00 a.m. EDT, followed by nose gear touchdown at 5:57:20 a.m., and wheelstop at 5:57:54 a.m. On board are STS-135 Commander Chris Ferguson, Pilot Doug Hurley, and Mission Specialists Sandy Magnus and Rex Walheim. On the 37th shuttle mission to the International Space Station, STS-135 delivered the Raffaello multi-purpose logistics module filled with more than 9,400 pounds of spare parts, equipment and supplies that will sustain station operations for the next year. STS-135 was the 33rd and final flight for Atlantis, which has spent 307 days in space, orbited Earth 4,848 times and traveled 125,935,769 miles. STS-135 also was the final mission of the Space Shuttle Program. For more information, visit www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts135/index.html. Photo credit: NASA/Tom Farrar and Tony Gray

CAPE CANAVERAL, Fla. -- Vapor trails follow space shuttle Atlantis as it approaches Runway 15 on the Shuttle Landing Facility at NASA's Kennedy Space Center in Florida for the final time. A vapor trail, known as a contrail, is a cloud of water vapor that condenses and freezes around the small particles in aircraft exhaust. Atlantis marked the 26th nighttime landing of NASA's Space Shuttle Program and the 78th landing at Kennedy. It also was the final mission for the shuttle program. STS-135 was the 33rd and final flight for Atlantis, which has spent 307 days in space, orbited Earth 4,848 times and traveled 125,935,769 miles. For more information on the space shuttle era, visit www.nasa.gov/mission_pages/shuttle/flyout. Photo credit: NASA/Sandra Joseph and Kevin O'Connell

CAPE CANAVERAL, Fla. -- STS-135 Commander Chris Ferguson and Pilot Doug Hurley perform touch-and-go landings on the Shuttle Landing Facility runway at NASA's Kennedy Space Center in Florida. The pilot and commander of every shuttle mission routinely practice landings aboard Shuttle Training Aircraft, which are Gulfstream II jets modified to mimic the shuttle's handling during the final phase of landing. The STS-135 flight crew of four arrived aboard T-38 training jets to watch two historic milestones of NASA's Space Shuttle Program -- the final landing of shuttle Endeavour, which will bookend its STS-134 mission to the International Space Station, and the final rollout of their vehicle, space shuttle Atlantis, to Launch Pad 39A. STS-135 will be the 33rd flight of Atlantis, the 37th shuttle mission to the space station, and the 135th and final mission of the shuttle program. For more information visit, www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts135/index.html. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. -- STS-135 Commander Chris Ferguson and Pilot Doug Hurley perform touch-and-go landings on the Shuttle Landing Facility runway at NASA's Kennedy Space Center in Florida. The pilot and commander of every shuttle mission routinely practice landings aboard Shuttle Training Aircraft, which are Gulfstream II jets modified to mimic the shuttle's handling during the final phase of landing. The STS-135 flight crew of four arrived aboard T-38 training jets to watch two historic milestones of NASA's Space Shuttle Program -- the final landing of shuttle Endeavour, which will bookend its STS-134 mission to the International Space Station, and the final rollout of their vehicle, space shuttle Atlantis, to Launch Pad 39A. STS-135 will be the 33rd flight of Atlantis, the 37th shuttle mission to the space station, and the 135th and final mission of the shuttle program. For more information visit, www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts135/index.html. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. -- STS-135 Commander Chris Ferguson, left, and Pilot Doug Hurley head out on the Shuttle Landing Facility at NASA's Kennedy Space Center in Florida to practice touch-and-go landings aboard two Shuttle Training Aircraft. The flight crew of four arrived aboard T-38 training jets to watch two historic milestones of NASA's Space Shuttle Program -- the final landing of shuttle Endeavour, which will bookend its STS-134 mission to the International Space Station, and the final rollout of their vehicle, space shuttle Atlantis, to Launch Pad 39A. STS-135 will be the 33rd flight of Atlantis, the 37th shuttle mission to the space station, and the 135th and final mission of the shuttle program. For more information visit, www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts135/index.html. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. -- STS-135 Commander Chris Ferguson and Pilot Doug Hurley are aboard Shuttle Training Aircraft to practice touch-and-go landings on the Shuttle Landing Facility runway at NASA's Kennedy Space Center in Florida. The flight crew of four arrived aboard T-38 training jets to watch two historic milestones of NASA's Space Shuttle Program -- the final landing of shuttle Endeavour, which will bookend its STS-134 mission to the International Space Station, and the final rollout of their vehicle, space shuttle Atlantis, to Launch Pad 39A. STS-135 will be the 33rd flight of Atlantis, the 37th shuttle mission to the space station, and the 135th and final mission of the shuttle program. For more information visit, www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts135/index.html. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. -- STS-135 Commander Chris Ferguson and Pilot Doug Hurley perform touch-and-go landings on the Shuttle Landing Facility runway at NASA's Kennedy Space Center in Florida. The pilot and commander of every shuttle mission routinely practice landings aboard Shuttle Training Aircraft, which are Gulfstream II jets modified to mimic the shuttle's handling during the final phase of landing. The STS-135 flight crew of four arrived aboard T-38 training jets to watch two historic milestones of NASA's Space Shuttle Program -- the final landing of shuttle Endeavour, which will bookend its STS-134 mission to the International Space Station, and the final rollout of their vehicle, space shuttle Atlantis, to Launch Pad 39A. STS-135 will be the 33rd flight of Atlantis, the 37th shuttle mission to the space station, and the 135th and final mission of the shuttle program. For more information visit, www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts135/index.html. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. -- STS-135 Commander Chris Ferguson and Pilot Doug Hurley perform touch-and-go landings on the Shuttle Landing Facility runway at NASA's Kennedy Space Center in Florida. The pilot and commander of every shuttle mission routinely practice landings aboard Shuttle Training Aircraft, which are Gulfstream II jets modified to mimic the shuttle's handling during the final phase of landing. The STS-135 flight crew of four arrived aboard T-38 training jets to watch two historic milestones of NASA's Space Shuttle Program -- the final landing of shuttle Endeavour, which will bookend its STS-134 mission to the International Space Station, and the final rollout of their vehicle, space shuttle Atlantis, to Launch Pad 39A. STS-135 will be the 33rd flight of Atlantis, the 37th shuttle mission to the space station, and the 135th and final mission of the shuttle program. For more information visit, www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts135/index.html. Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. -- STS-135 Commander Chris Ferguson and Pilot Doug Hurley perform touch-and-go landings on the Shuttle Landing Facility runway at NASA's Kennedy Space Center in Florida. The pilot and commander of every shuttle mission routinely practice landings aboard Shuttle Training Aircraft, which are Gulfstream II jets modified to mimic the shuttle's handling during the final phase of landing. The STS-135 flight crew of four arrived aboard T-38 training jets to watch two historic milestones of NASA's Space Shuttle Program -- the final landing of shuttle Endeavour, which will bookend its STS-134 mission to the International Space Station, and the final rollout of their vehicle, space shuttle Atlantis, to Launch Pad 39A. STS-135 will be the 33rd flight of Atlantis, the 37th shuttle mission to the space station, and the 135th and final mission of the shuttle program. For more information visit, www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts135/index.html. Photo credit: NASA/Kim Shiflett