Behind the Scenes with the Atlantis Crew

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Photographer Smiley N. Pool documents the four astronauts who will ride the last space shuttle as they get ready for their historic mission

Smiley N. Pool / Houston Chronicle / AP

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Weightless Training
Astronaut Rex Walheim is aided by divers in the Neutral Buoyancy Laboratory near the Johnson Space Center as he works in a mock up of the space shuttle's payload bay, part of a training exercise for a space walk, March 10, 2011.

A Photo History of the Space Shuttle Program

Behind the Scenes with the Atlantis Crew

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