Variety of different dune types in southern Lyot Crater in the Northern lowlands on Mars. Transverse dunes to the west grade into longitudinal dunes downwind to the east and barchans to the south, possibly because of local winds channeled by topography in the impact basin. via /r/spaceporn https://ift.tt/2NfGZee
via Tumblr https://ift.tt/34MV9ZK
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