Space shuttle Atlantis lands at the Kennedy Space Center at Cape Canaveral, Fla., on Thursday, July 21, 2011. The landing of the spacecraft marks the end of NASA's 30-year shuttle program. (AP Photo/Pierre Du Charme, Pool)
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Space shuttle Atlantis lands at the Kennedy Space Center at Cape Canaveral, Fla., on Thursday, July 21, 2011. The landing of the spacecraft marks the end of NASA's 30-year shuttle program. (AP Photo/Pierre Du Charme, Pool)
