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Iceball Mars?

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Science  11 Apr 2003:
Vol. 300, Issue 5617, pp. 234-236
DOI: 10.1126/science.300.5617.234

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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.