HiRISE regularly takes repeat images of gullies to look for changes. This site is one of the most frequent monitoring sites, with more than 70 images to date.

It is imaged frequently because due to the latitude, the gullies have a long season with carbon dioxide frost (dry ice) moving rocks and dust around the surface. In past images we’ve seen many previous changes, both to the frost patterns and the underlying ground.

This image is the first one for this Mars year, but you can already see dark spots where gas is breaking out from under the frost and taking sand and dust with it. HiRISE will try to take more images this year to see how the surface changes, so check again in a few months!

ID: ESP_090596_1115
date: 23 November 2025
altitude: 252 km

https://uahirise.org/hipod/ESP_090596_1115
NASA/JPL-Caltech/University of Arizona
#Mars #science #NASA