NASA's Mars Global Surveyor shows a portion of a chain of pits on a lava- and dust-covered plain northwest of Tharsis Tholus, one of the many volcanic constructs in the Tharsis region of Mars.

17 May 2006
This Mars Global Surveyor (MGS) Mars Orbiter Camera (MOC) image shows a portion of a chain of pits on a lava- and dust-covered plain northwest of Tharsis Tholus -- one of the many volcanic constructs in the Tharsis region of Mars. Pit chains, such as this one, are associated with the collapse of surface materials into subsurface voids formed by faulting and expansion -- or extension -- of the bedrock.

Location near: 16.4°N, 92.6°W
Image width: ~3 km (~1.9 mi)
Illumination from: lower left
Season: Northern Winter

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