NASA Space Shuttle Atlantis International Space Station STS-135 mission prime crew member American astronaut Rex Walheim undergoes water survival training at the Johnson Space Center Neutral Buoyancy Laboratory February 9, 2010 in Houston, Texas. (photo by Lauren Harnett via Planetpix)

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Size: 3434px × 5150px
Photo credit: © NASA Photo / Alamy / Afripics
License: Licensed
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