The picture shows a crater rim facing south (68 ° S lat.) In the Sisyphi Planum of the Red Planet. This is a color composite image obtained on September 2, 2018 using CaSSIS, when the southern hemisphere plunged into the end of spring.
The brightest seem to be residual carbon dioxide deposits in the southern slopes of the crater. In the colder months, carbon dioxide and some water vapor freeze on the surface. When the sun rises again in the sky, the ice sublimates, revealing the underlying surface. It is known that this crater has active ravines - small, carved network of narrow channels on the edge, associated with garbage flows. In this photo you can see icy streams of material, possibly created due to the “thawing” of ice as the seasons change.
The study of seasonal transformations of ice and frost on Mars is one aspect of the ExoMars mission. The picture covers 20 x 8 km, and the resolution reaches 4.5 m per pixel. North is located at 45 ° in the upper left corner.
