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A subtledetailhas been identified by health experts that could reveal astronautSunita Williamsshealthcondition.
After an unexpected nine months onthe ISS, Williams and Wilmoresdramatic changein appearance surprised viewers.
After landing off the coast of Florida, astronauts stepped out of theirSpaceXDragon capsule.
Whileboth astronautslooked tired, Williams, 59, was helped onto a stretcher.
On Earth, gravity forces muscles to work against it, creating a mechanical load that prevents atrophy.
This may be because it is really hard to maintain muscle mass in space without the help of gravity.
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