This image of Mars shows the north polar ice cap, the border between highlands and lowlands, former river valleys, plains covered by dark sands and the large Hellas Planitia impact basin in the south. Credit: ESA/DLR/FU Berlindjellison t1_j98mah6 wrote
Reply to comment by Adialaktos in This image of Mars shows the north polar ice cap, the border between highlands and lowlands, former river valleys, plains covered by dark sands and the large Hellas Planitia impact basin in the south. Credit: ESA/DLR/FU Berlin by MistWeaver80
A spacecraft was sent up there - https://www.nasa.gov/mission_pages/phoenix/main/index.html - and was able to establish ground truth for the existence of sub surface ice.
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