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MGS MOC Release No. MOC2-410, 3 July 2003 Mars Global Surveyor's (MGS) Mars Orbiter Camera (MOC) has obtained thousands of images of martian sand dunes since it began observing the planet from orbit in 1997. Many of the dunes appear to be inactive in the modern environment, but appear to be quite young, otherwise (they do not have any small meteor impact craters on them, they often have sharp edges and brinks--all attributes of modern, active dunes). In some dune fields, as in Herschel Basin in Terra Cimmeria, the dunes are grooved (e.g., see
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