PIA23145: Gullies in Acidalia Planitia
 Target Name:  Mars
 Is a satellite of:  Sol (our sun)
 Mission:  Mars Reconnaissance Orbiter (MRO)
 Spacecraft:  Mars Reconnaissance Orbiter (MRO)
 Instrument:  HiRISE
 Product Size:  2880 x 1800 pixels (w x h)
 Produced By:  University of Arizona/HiRISE-LPL
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 Full-Res TIFF:  PIA23145.tif (5.027 MB)
 Full-Res JPEG:  PIA23145.jpg (592.7 kB)

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This crater is located in Acidalia Planitia. It is situated in a sparsely cratered area of elongated mounds and hosts a variety of gully forms on its eastern, northern, and western interior slopes. This observation is centered on the crater's western slope and captures gullies with prominent alcoves, boulders, and outcrops.

The incised gully channels terminate in a variety of alluvial fans. Some have edges or margins that are finger-like with light-toned deposits while other fans are more lobe-shaped. Many have fractures mid-slope that appear to have cut across the gullies and may suggest glacial processes were once active. Fractures such as these are similar to what are known as "glacial crevasses" on Earth.

Linear stippled regions cover the floor of the crater that may represent areas of subsurface ice sublimation.

The map is projected here at a scale of 50 centimeters (19.7 inches) per pixel. (The original image scale is 61.2 centimeters [24.1 inches] per pixel [with 2 x 2 binning]; objects on the order of 184 centimeters [72.4 inches] across are resolved.) North is up.

The University of Arizona, in Tucson, operates HiRISE, which was built by Ball Aerospace & Technologies Corp., in Boulder, Colorado. NASA's Jet Propulsion Laboratory, a division of Caltech in Pasadena, California, manages the Mars Reconnaissance Orbiter Project for NASA's Science Mission Directorate, Washington.

Image Credit:
NASA/JPL-Caltech/University of Arizona

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