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Science 21 September 2007:
Vol. 317. no. 5845, p. 1673
DOI: 10.1126/science.317.5845.1673
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News Focus

PLANETARY SCIENCE:
Is Mars Looking Drier and Drier for Longer and Longer?

Richard A. Kerr

A report in this week's issue of Science (p. 1706) shows that the more closely planetary scientists scrutinize the Red Planet, the less wet and weathered its surface appears to be, even in the solar system's earliest days.

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