4 of 17: The space shuttle Atlantis astronauts left to right, pilot Doug Hurley, mission specialist Sandy Magnus, commander Chris Ferguson and mission specialist Rex Walheim, leave the operations and check-out building on their way to the pad at the Kennedy Space Center Friday, July 8, 2011, in Cape Canaveral, Fla. Atlantis is the 135th and final space shuttle launch for NASA. (AP Photo/Chris O'Meara)

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