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Water Everywhere on Early Mars But Only for a Geologic Moment?

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Science  25 Jul 2008:
Vol. 321, Issue 5888, pp. 484-485
DOI: 10.1126/science.321.5888.484

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Summary

Planetary scientists pursuing water and life on Mars must reconcile mounting evidence of a young planet awash in life-sustaining water with a growing realization that the martian surface was likely almost always dry.