The largest crater in Planum Australe is McMurdo Crater. Planum Australe is the southern polar plain on Mars. It extends southward of roughly 75°S and is centered at 83. 9°S 160. 0°E. The geology of this region was to be explored by the failed NASA mission Mars Polar Lander, which lost contact on entry into the Martian atmosphere. A seasonal ice cap forms on top of the permanent one during the Martian winter, extending from 60°S southwards. Planum Australe is partially covered by a permanent polar ice cap composed of frozen water and carbon dioxide about 3 km thick. It is possible that the area of this ice cap may be shrinking due to localized climate change or more widespread global warming. It is, at the height of winter, approximately 1 metre thick. High Quality Content by WIKIPEDIA articles!
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