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What Was a 'Wet and Warm' Early Mars Really Like?

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Science  28 Mar 2008:
Vol. 319, Issue 5871, pp. 1757
DOI: 10.1126/science.319.5871.1757b

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Summary

A workshop focused on the first period of martian geologic history, held prior to the Lunar and Planetary Science Conference, came to few conclusions about Mars�s transition from warm and wet to cold and dry.