When a solid state turns directly into a gaseous one (called sublimation), darker material is suddenly exposed and then later fans out because of the wind. These dark spots litter this scene of dunes in the south polar region of Mars.

ID: ESP_055340_1185
date: 17 May 2018
altitude: 249 km

https://uahirise.org/hipod/ESP_055340_1185
NASA/JPL-Caltech/UArizona
#Mars #science #NASA