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Taken in March 2002, this Surveyor image shows two inactive, ancient Mars volcanoes. The upper one is called Uranius Tholus, the lower one Ceraunius Tholus.
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12.17.2009

Taken in March 2002, this Surveyor image shows two inactive, ancient Mars volcanoes. The upper one is called Uranius Tholus, the lower one Ceraunius Tholus.

Image Credit: NASA/JPL-Caltech

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