A rock outcrop dubbed "Missoula," near Marias Pass on Mars, is seen in this image mosaic taken by the Mars Hand Lens Imager on NASA's Curiosity rover.
Credit: NASA/JPL-Caltech/MSSS
Approaching the third anniversary of its landing on Mars, NASA's Curiosity Mars rover has found a target unlike anything it has studied before—bedrock with surprisingly high levels of silica.
From Jet Propulsion Laboratory/NASA
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