This image from NASA's Mars Global Surveyor shows gullies formed in the wall of a depression located on the floor of Rabe Crater west of the giant impact basin, Hellas Planitia on Mars.

26 February 2006
This Mars Global Surveyor (MGS) Mars Orbiter Camera (MOC) image shows gullies formed in the wall of a depression located on the floor of Rabe Crater west of the giant impact basin, Hellas Planitia. Gullies such as these are common features on Mars, but the process by which they are formed is not fully understood. The debate centers on the role and source of fluids in the genesis of these features.

Location near: 44.1°S, 325.9°W
Image width: ~3 km (~1.9 mi)
Illumination from: upper left
Season: Southern Summer

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