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The first astronauts sent to Mars should be prepared to spend the rest of their lives there, in the same way that European pioneers headed to America knowing they would not return home, says moonwalker Buzz Aldrin. "[the distance and difficulty is why you should] send people there permanently," Aldrin said. "If we are not willing to do that, then I don't think we should just go once and have the expense of doing that and then stop."