A Checkup Aboard Skylab
Each of the three crewed Skylab missions from May 1973 to 1974 were staffed by three astronauts. Since these were the longest missions ever conducted in low Earth orbit, one of the top science priorities was to collect medical data on the affects of long spaceflights on humans.
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https://www.nasa.gov/image-detail/checkup-aboard-skylab/
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