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Science 6 December 2002:
Vol. 298. no. 5600, p. 1866
DOI: 10.1126/science.298.5600.1866a
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News of the Week

PLANETARY SCIENCE:
A Smashing Source of Early Martian Water?

Richard A. Kerr

According to the geological evidence, early in its history Mars had running water on its surface. But climate modelers can't explain why Mars would have been any warmer in its earliest days than it is today. Now, on page 1977, a group of physics-inclined planetary scientists proposes a solution to that conundrum: giant asteroid impacts.

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