Mystery stone circles may point to water on Mars

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Using cameras on NASA's Mars Reconnaissance Orbiter, Matt Balme of the Open University in Milton Keynes, UK, and his colleagues mapped the Elysium Planitia, a region near the equator. They saw rings up to twenty-three meters across made up of stones sorted by size into concentric bands.

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Water's role in Martian chemistry becoming clearer

sea-maid submitted, created time 3 months 6 days (www.sciencenews.org)

As its mission nears its end, the NASA Phoenix Mars Lander finds strong evidence for minerals similar to those formed on Earth by liquid water.

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