For example, apparently nothing can prevent degeneration of bones in weightlessness. All these might imply that space flights for people cannot be sufficiently long even to reach close planets, not speaking about more distant places in space. We cannot create sufficiently big gravitational attractor as the Earth is. And so, it might look as people cannot inhabit space stations for a really long stay. Simply, human organisms demands weight and it is our destiny to remain close to a big planet, as we are now.
Weight is a vital condition for our life to go normally.
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