At NASA's Kennedy Space Center in Florida, space shuttle Atlantis enters Orbiter Processing Facility-1, where it will be processed for the unlikely event it is needed as a rescue spacecraft for the final shuttle flight, Endeavour's STS-143 mission. Atlantis touched down on the Shuttle Landing Facility's Runway 33 after 12 days in space, completing the 4.8-million mile STS-132 mission to the International Space Station. Photo credit: Jack Pfaller May 26, 2010
