NASA Space Shuttle Atlantis International Space Station STS-135 mission prime crew member American astronaut Rex Walheim participates in underwater spacewalk training at the Johnson Space Center Neutral Buoyancy Laboratory November 22, 2010 in Houston, Texas. (photo by Robert Markowitz via Planetpix)

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Size: 5150px × 3427px
Photo credit: © NASA Photo / Alamy / Afripics
License: Licensed
Model Released: No

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