News of the WeekPlanetary Science

Signs of Ancient Rain May Stretch Mars's Balmy Past

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Science  02 Jul 2004:
Vol. 305, Issue 5680, pp. 26
DOI: 10.1126/science.305.5680.26

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On page 78, planetary geologists report the discovery of dense networks of rain-carved valleys dating from near the end of the half-billion-year-long Hesperian epoch, when geologists believe that Mars was completely iced up.