Mars No. 42-22377790
by NASA - digital version copyright - © Corbis. All Rights Reserved. - © NASA - digital version copyright/Science Faction/Corbis
Detail of Geology of Ascraeus Mons From Orbit, Mars, Seen by Mars Global Surveyor
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. Large, dark boulders occur on the floors of some of the pits. The picture covers an area 3 km (1.9 mi) wide and is illuminated by sunlight from the lower left. --- Image by © NASA - digital version copyright/Science Faction/Corbis