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Last updated on April 15, 2014 at 21:23 EDT
Volcanoes Ceraunius Tholus and Uranius Tholus
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Volcanoes Ceraunius Tholus and Uranius Tholus

March 19, 2003
Acquired in March 2002, this Mars Global Surveyor (MGS) Mars OrbiterCamera (MOC) wide angle view shows the martian volcanoes, CerauniusTholus (lower) and Uranius Tholus (upper). The presence of impact craterson these volcanoes, particularly on Uranius Tholus; indicates that theyare quite ancient and are not active today. The light-toned area on thesoutheastern face (toward lower right) of Ceraunius Tholus is a remnantof a once more extensive deposit of dust from the global dust storm eventsthat occurred in 2001. The crater at the summit of Ceraunius Tholus isabout 25 km (15.5 mi) across. Sunlight illuminates the scene from thelower left.