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NASA's Curiosity Rover Sharpens Paradox of Ancient Mars

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Mars bedrock

Bedrock at this site added to a puzzle about ancient Mars by indicating that a lake was present, but that little carbon dioxide was in the air to help keep a lake unfrozen.

Credit: NASA/JPL-Caltech/MSSS

Mars scientists are wrestling with a problem.

From Jet Propulsion Laboratory/NASA
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