The Russians already have proven the ability of a man to live 15 months in space. Mind you, that was in low earth orbit. Still, within Earth's magnetic field.
Going to Mars will require either invulnerable spacemen, or (b) adequate shielding. The current candidate for that is the water needed for the trip.
This is bullshit. Weightlessness is a problem because of atrophy and bone loss, yes. But *The Russians already did that. They sent up guys in a can in orbit for a LONG time* on Mir. Due to bungee cords, t
Source: http://rss.slashdot.org/~r/Slashdot/slashdotScience/~3/fnepzVpYqFo/story01.htm
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