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. Davies is one of... more 
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. 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 could make Earth uninhabitable. less 
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Associated Press | Photo By Ross D. Franklin
Thu, Nov 18, 2010 5:09 AM EST