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http://cen.acs.org/articles/93/i10/Ancient-Mars-Enough-Water-Giant.html

As shown in this computer simulation, 4.5 billion years ago, some 20% of Mars’s surface was blanketed by a water ocean. That’s according to a new study of water molecules in the Red Planet’s atmosphere ( Science 2015, DOI: 10.1126/science.aaa3630)…..