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Nasa Rover Findings Point to a More Earth-Like Martian Past

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Curiosity Mars rover at Windjana, Mars

This scene shows NASA's Curiosity Mars rover at a location called "Windjana," where the rover found rocks containing manganese-oxide minerals, which require abundant water and strongly oxidizing conditions to form.

Credit: NASA/JPL-Caltech/MSSS

Chemicals found in Martian rocks by NASA's Curiosity Mars rover suggest the Red Planet once had more oxygen in its atmosphere than it does now.

From Jet Propulsion Laboratory/NASA
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