Ice belt 'encircled Mars equator'

Europe's Mars Express probe may have found evidence for a band of ice that once spanned the Martian equator. A frozen sea and patterns of glacial activity on the planet may be a relic of this ancient belt of ice, says a top scientist. The ice may have formed just before five million years ago due to a change in the tilt of Mars.

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http://news.bbc.co.uk/2/hi/science/nature/4226236.stm