THEMIS: Active sand dunes in Sirenum crater

Active dunes in Sirenum crater (THEMIS_IOTD_20170306)THEMIS Image of the Day, March 6, 2017. Today’s VIS image shows a field of dunes on the floor of an unnamed crater in Terra Sirenum. Their dark color indicates they are dust-free and suggests that the dune sands are activiely moving under the wind.

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