The space shuttle Atlantis astronauts left to right, mission specialists Rex Walheim, Sandy Magnus, pilot Doug Hurley and commander Chris Ferguson wave after leaving 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. Shuttle Atlantis is scheduled to launch on Friday, July 8 and is the 135th and final space shuttle launch for NASA..  (AP Photo/Alex Menendez)
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