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STS_135_ SSTF | NASA Image | Cosmos Observatory | Cosmos Observatory

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STS_135_ SSTF

STS_135_ SSTF

NASA astronauts Rex Walheim, Doug Hurley and Chris Ferguson work on computers in an exercises to overcome a power loss on the International Space Station as the crew of STS-135, the final space shuttle mission, trains in the Space Station Training Facility at the Johnson Space Center on Thursday, May 19, 2011, in Houston. ( NASA Photo / Houston Chronicle, Smiley N. Pool ).

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