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2015-03-06 08:00:28

An artist’s impression showing how Mars may have looked about 4 billion years ago. The young planet would have had enough water to cover its entire surface in a liquid layer about 140 metres deep. More likely, however, the liquid would have pooled forming an ocean spanning almost half of Mars' northern hemisphere, in some regions reaching depths greater than 1.6 kilometers.

Image uploaded by Robert Myles
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