Polar Pit Gullies
This observation shows partial views of two high latitude pits. These polar pits contain gullies, small-scale slope features that are proposed to require some amount of liquid water to form.
Several of the gullies have multiple channels and debris aprons from numerous flows that occurred throughout time. Many of the gullies are seen to originate at a boulder layer at the pit edges. This layer is deteriorating and releasing boulders that can be seen rolling down the pit walls. The bright material near the pit edges is probably seasonal frost.
The full HiRISE image that includes this view is online at http://hirise.lpl.arizona.edu/PSP_004988_1085
Credit: NASA/JPL-Caltech/University of Arizona
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