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Skylab 4 astronaut floats through Skylab's airlock module hatch with his arms outstretched.

Astronaut Edward Gibson sails through airlock module hatch

SL4-150-5074 (February 1974) --- Scientist-astronaut Edward G. Gibson, science pilot for the Skylab 4 mission, demonstrates the effects of zero-gravity as he sails through airlock module hatch. Photo credit: NASA

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