This fascinating observation shows us a dark-toned mound with pits inside an impact crater . Are these pits the result of sublimation?
The crater itself is an ancient one, as evidenced by the eroded rim. For the mound inside, HiRISE resolution can give us a closer look at textural features that might help explain what we’re looking at: layers in pit walls, or perhaps cracks from expansion?
Written by: HiRISE Science Team (audio: Tre Gibbs) (26 March 2014)
This is a stereo pair with ESP_034324_2040 .
More info and image formats at http://hirise.lpl.arizona.edu/ESP_034970_2040
Image: NASA/JPL/University of Arizona