Last updated on April 18, 2014 at 1:21 EDT
Equator-Facing Slope with Gullies
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Equator-Facing Slope with Gullies

January 29, 2009
This image shows portions of the northwest and southwest rims of a northern hemisphere crater. The northwest rim has gullies, features frequently proposed to be carved by fluvial processes or debris flows.

The dark material on the crater floor is dust; some if it has been moved by dust devils to form the dark streaks visible here.

The scene has two main textures: smooth and pitted. The smooth, mantling material is thought to be ice-rich. The pitted regions are thought to mark locations where the subsurface ice has been removed by sublimation, when ices convert directly to gas.