Volcanoes Ceraunius Tholus and Uranius Tholus
Acquired in March 2002, this Mars Global Surveyor
(MGS) Mars Orbiter Camera (MOC) wide angle view shows the martian
volcanoes, Ceraunius Tholus (lower) and Uranius Tholus (upper). The
presence of impact craters on these volcanoes, particularly on Uranius
Tholus; indicates that they are quite ancient and are not active today. The
light-toned area on the southeastern face (toward lower right) of
Ceraunius Tholus is a remnant of a once more extensive deposit of dust
from the global dust storm events that occurred in 2001. The crater at the
summit of Ceraunius Tholus is about 25 km (15.5 mi) across. Sunlight
illuminates the scene from the lower left.
Image Credit: NASA/JPL/Malin Space Science Systems
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