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May 8, 2015
Q. How are astronauts affected by spending a year in the zero gravity of space?
A. The sustained body weightlessness may bring on weakening of the calf muscles, quadriceps, and neck and back muscles that must generally work against the force of gravity, says Jeffrey Kluger in Time magazine. Bones may lose minerals and weaken, and as calcium is flushed from the body it may become concentrated into kidney stones. Plus, skin thins and loses elasticity, at times becoming more sensitive and giving way to infections and slower healing.
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