In this photo taken Oct. 28, 2010, Dr. Paul Davies, of Arizona State University, holds a book on Mars as he stands in the atrium of the Biodesign Institute building on the ASU campus in Tempe, Ariz. Davies is one of two scientists that are proposing we send volunteers to Mars and leave them there. Dr. Davies says 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 mades Earth uninhabitable. (AP Photo/Ross D. Franklin)

Associated Press
In this photo taken Oct. 28, 2010, Dr. Paul Davies, of Arizona State University, holds a book on Mars as he stands in the atrium of the Biodesign Institute building on the ASU campus in Tempe, Ariz.  Davies is one of two scientists that are proposing we send volunteers to Mars and leave them there.  Dr. Davies says 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 mades Earth uninhabitable. (AP Photo/Ross D. Franklin)
In this photo taken Oct. 28, 2010, Dr. Paul Davies, of Arizona State University, holds a book on Mars as he stands in the atrium of the Biodesign Institute building on the ASU campus in Tempe, Ariz. Davies is one of two scientists that are proposing we send volunteers to Mars and leave them there. Dr. Davies says 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 mades Earth uninhabitable.
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