“Once in a Blue Dune” was uploaded to Flickr

Sand dunes often accumulate in the floors of craters. In this region of Lyot Crater, NASA's Mars Reconnaissance Orbiter (MRO) shows a field of classic barchan dunes on Jan. 24, 2018. via NASA ift.tt/2M9bzkO
embiggen by clicking https://flic.kr/p/JJWhNv
Once in a Blue Dune was taken on June 20, 2018 at 04:31AM