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MGS MOC Release No. MOC2-540, 10 November 2003 This August 2003 Mars Global Surveyor (MGS) Mars Orbiter Camera (MOC) picture shows the defrosting floor of a pit in the south polar region near 71.7S, 1.6W. The surface exhibits an array of cracks and bands that are emphasized by frost. Some of these are polygons similar to those that form in Earth's arctic and antarctic regions by processes of freezing and thawing of ground ice. Other bands might represent exposures of layered bedrock. Whether there is ice beneath the ground that has influenced the pattern of cracks and bands is unknown. This picture covers an area 3 km (1.9 mi) wide and is illuminated by sunlight from the upper left.
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