Certain details of the Martian surface can look strange, unless you take a look at the context to which they belong.
This image, in particular, shows us a detail of a crater located at about 28 ° south latitude in mid-winter.
The interior of this crater shows clear signs of glacial flows, very frequent at mid-latitudes of Mars, demonstrating the abundant presence of water just below the surface.
Complete HiRISE image: https://www.uahirise.org/ESP_053734_1515
Reference article NASA JPL: https://www.jpl.nasa.gov/spaceimages/details.php?id=PIA22348
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