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Science 2 July 2004:
Vol. 305. no. 5680, p. 26
DOI: 10.1126/science.305.5680.26
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News of the Week

PLANETARY SCIENCE:
Signs of Ancient Rain May Stretch Mars's Balmy Past

Richard A. Kerr

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.

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