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As far as a Mars mission. Even as far back as the 80's (the Ride document) it has been discussed that older astronauts would most likely be used for extended missions such as Mars. The idea being that if the effects of extended radiation exposure take years to decades to manifest (i.e. cancer) a younger astronaut would be more likely to suffer the ill-effects than an older one would.
What are the human challenges of a long-duration mission to Mars. Can the psychological and physiological challenges of this trip be met?
Originally posted by Amuk
There is also resurch into using electrical pulses to the nerves in your muscles to work them out in zero-g. Although not perfected or able to solve all the problems it shows promise.
Originally posted by specialasianX To the guy who asked why the astronauts wouldnt be able to see earth...