NASA astronaut Rex Walheim, STS-135 mission specialist, prepares to train in the Neutral Buoyancy Laboratory (NBL) near NASA's Johnson Space Center in Houston March 10, 2011.
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Taken in
Johnson Space Center
Author
NASA Photo/Houston Chronicle, Smiley N. Pool
Description
NASA astronaut Rex Walheim, STS-135 mission specialist, prepares to train in the Neutral Buoyancy Laboratory (NBL) near NASA's Johnson Space Center in Houston March 10, 2011.