well if we do go to mars we can never come back and it is possible that after two years in 0g we cannot even live on mars. we can't speed the craft too far up or else they will either burn up in entry or land about 20ft into the ground either way not a pretty picture. of course people are looking into ways to be able to live on mars and theres one that I heard about involving bears. ask if you want to know.
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