NASA / JPL-CALTECH / UNIV. OF ARIZONA / SCIENCE PHOTO LIBRARY NASA / JPL-CALTECH / UNIV. OF ARIZONA / SCIENCE PHOTO LIBRARY
Mars' north polar cap. Satellite image showing the icy surface of Mars' north polar cap. The ice on Mars is frozen Carbon Dioxide. At Mars' North Pole is a dome of icy layers ranging up to 2 kilometres thick, similar to Earth's ice caps in Greenland and Antarctica. Imaged by the High Resolution Imaging Science Experiment (HiRISE) camera on NASA's Mars Reconnaissance Orbiter (MRO) satellite.
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