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Science 25 July 2008:
Vol. 321. no. 5888, pp. 484 - 485
DOI: 10.1126/science.321.5888.484
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PLANETARY SCIENCE:
Water Everywhere on Early Mars But Only for a Geologic Moment?

Richard A. Kerr

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.

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Science. ISSN 0036-8075 (print), 1095-9203 (online)