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Published online 3 June 2008 | Nature News 453, 703 (2008) | doi:10.1038/453703a
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Mars reveals early mysteries
Planet's surface proves a puzzle for Phoenix probe.
When NASA's Phoenix spacecraft settled in Mars' northern latitudes on 25 May, there was little doubt that it would land amid a quilted pattern of troughs created over time by ice contracting and cracking below the surface. The surprise is that Phoenix is surrounded by 'polygons' much smaller than expected.
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