NASA's Mars Global Surveyor shows collapse pits on the northern flank of the giant Tharsis shield volcano, Ascraeus Mons on Mars. Large, dark boulders occur on the floors of some of the pits.

31 January 2004
This Mars Global Surveyor (MGS) Mars Orbiter Camera (MOC) image shows collapse pits on the northern flank of the giant Tharsis shield volcano, Ascraeus Mons. Details in rock and dust are seen when this image is examined at its full, 1.5 meters (5 ft) per pixel resolution. Large, dark boulders occur on the floors of some of the pits, for example. This scene is located near 13.1°N, 103.1°W. The picture covers an area 3 km (1.9 mi) wide and is illuminated by sunlight from the lower left.

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