Scientists have known for decades that prolonged exposure to microgravity can harm human vision. With evidence suggesting that damage might be permanent, some are suggesting this condition might be a showstopper for deep space manned missions, including manned missions to Mars.
A possible counter for the condition would be to spin all or part of a ship to produce artificial gravity, but researchers don't know exactly what causes the problem yet, so any possible fix is premature.
Tuesday, April 8, 2014
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