PIA05643: Mid-Latitude Gullies
 Target Name:  Mars
 Is a satellite of:  Sol (our sun)
 Mission:  Mars Global Surveyor (MGS)
 Spacecraft:  Mars Global Surveyor Orbiter
 Instrument:  Mars Orbiter Camera (MOC)
 Product Size:  1590 x 2385 pixels (w x h)
 Produced By:  Malin Space Science Systems
 Producer ID:  MOC2-668
 Full-Res TIFF:  PIA05643.tif (3.796 MB)
 Full-Res JPEG:  PIA05643.jpg (836.2 kB)

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Original Caption Released with Image:

17 March 2004
This Mars Global Surveyor (MGS) Mars Orbiter Camera (MOC) image shows gullies in the wall of a crater near 39.1S, 200.7W. Discussion among Mars scientists as to how martian middle-and polar-latitude gullies formed continues to this day. They were first observed in MGS MOC images and reported in June 2000. Most investigators agree that gullies, such as those shown here, were formed by running water, but disagree on whether the liquid came from snowmelt, groundwater, or melting ground ice. Still others argue that the fluid was carbon dioxide, and a few suggest that the gullies formed "dry"--that is, by landsliding processes involving no liquid or gas. This January 2004 MOC full-resolution (1.5 m/pixel; 5 ft./pixel) image is illuminated by sunlight from the upper left. The 300 m scale bar is approximately 984 ft. long.

Image Credit:
NASA/JPL/Malin Space Science Systems

Image Addition Date: