APTOPIX Space Shuttle

  The space shuttle Atlantis astronauts left to right, mission specialists Rex Walheim, Sandy Magnus, pilot Doug Hurley and commander Chris Ferguson, leave the operations and check-out building on the 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/Terry Renna)
The space shuttle Atlantis astronauts left to right, mission specialists Rex Walheim, Sandy Magnus, pilot Doug Hurley and commander Chris Ferguson, leave the operations and check-out building on the 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/Terry Renna)

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