One Way to Mars
This undated file photo taken by the NASA Hubble Space Telescope shows the planet Mars. Two scientists are proposing we send volunteers to Mars and leave them there. They say the mission would mark the beginning of long-term human colonization of Mars, with numerous follow-up trips. The colleagues contend one-way missions could happen a lot quicker and cheaper, and it is essential to begin colonizing another planet as a hedge against a catastrophe that makes Earth uninhabitable.
(AP Photo/NASA Hubble Space Telescope)
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