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Science 11 April 2003:
Vol. 300. no. 5617, pp. 234 - 236
DOI: 10.1126/science.300.5617.234
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News Focus

PLANETARY SCIENCE:
Iceball Mars?

Richard A. Kerr

Incessant wobbling of Mars seems to trigger intermittent ice ages that could explain everything from watery gullies that have been seen as seeps to geologic layering taken to be signs of lakes.

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