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Monday, November 23, 2009

Photo: Mars Once Had Oceans, New Evidence Suggests


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An artist's reconstruction shows Mars as it might have looked more than two billion years ago, with a massive ocean filling a basin that now lies in the planet's north.

Evidence for the ocean that had previously been discounted because of strange surface features shouldn't be discounted, suggest scientists who have developed a new theory about Mars's shifting poles.

Image courtesy Tyler Perron/Nature