This image was acquired to take a closer look at a circular feature that might be an impact structure on the South Polar layered deposits.

Measuring the sizes and frequency of impact craters provides a constraint on the age of the landscape. However, craters in icy terrain are modified by processes that flatten and change them in such a manner that it is hard to say for sure if it had an impact origin.

Written by: Alfred McEwen (audio: Tre Gibbs)  (3 April 2017)

More info and image formats at http://hirise.lpl.arizona.edu/ESP_049075_0995

Image: NASA/JPL/University of Arizona