NASA employees sign a banner at the Kennedy Space Center at Cape Canaveral, Fla. Thursday, July 21, 2011. Space shuttle Atlantis landed early Thursday, ending NASA’s 30-year space shuttle program. (AP Photo/Dr. Scott M. Lierberman)
NASA employees sign a banner at the Kennedy Space Center at Cape Canaveral, Fla. Thursday, July 21, 2011. Space shuttle Atlantis landed early Thursday, ending NASA’s 30-year space shuttle program. (AP Photo/Dr. Scott M. Lierberman)
