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(NASA)

Swimming Lessons

Astronauts had to swim before they could walk.

STS-31

None
(NASA)

Just a few weeks before their launch date of April 24, 1990, STS-31 astronauts Bruce McCandless and Kathryn Sullivan practice space walking in the Weightless Environment Training Facility at the Johnson Space Center. McCandless (left) works with a mockup of the shuttle's remote manipulator arm, while Sullivan manipulates Hubble Space Telescope hardware on the support system module forward shell. The main purpose of the shuttle mission was to deploy the Hubble Space Telescope.

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