Perennial Frost in a Crater on the Northern Plains
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Most surface ice on Mars is temporary. The polar layered deposits are thick stacks of permanent water ice at each pole, and the South Polar residual cap may be a permanent although dynamic layer of carbon dioxide ice as seen by NASA Mars Reconnaissanc — NASA JPL · 2014. ABD devlet eseri: kamu mali, ticari islerde de serbestce kullanilabilir.
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