THEMIS: Active dunes in Noachis Terra

Active dune field in a crater (THEMIS_IOTD_20181128)THEMIS Image of the Day, November 28, 2018. Today’s VIS image shows a sand sheet with surface dunes forms on the floor of an unnamed crater in Noachis Terra.

Dark dunes indicate active dunes: Winds stir the sand, which kicks off the light-toned dust, leaving behind the sand. The sands’ dark tone comes from the breakdown of basalt, a dark volcanic rock common all over Mars.

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