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Published online 10 February 2004 | Nature | doi:10.1038/news040209-2

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Martian 'pebbles' don't prove watery past

NASA probe could be walking on broken glass.

Mark Peplow

NASA's Spirit and Opportunity rovers continue to send back photos from Mars, some offering tantalising geological evidence that water once flowed across the red planet's surface. But researchers caution that there are other explanations.

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