The idea that Mars used to be a "water world" and sort of like a smaller version of Earth in many ways is now pretty much accepted among planetary scientists; the debate continues however as to just how...
Paul Scott Anderson is a freelance space writer with a life-long passion for space exploration and astronomy and has been a long-time member of The Planetary Society. He currently writes for Universe Today and Examiner.com. His own blog The Meridiani Journal is a chronicle of planetary exploration.
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