Beautiful Barchans

Barchan sand dunes in Mars’ Arkhangelsky Crater This image from the Mars Reconnaissance Orbiter’s HiRISE camera features a barchan dune within the floor of Arkhangelsky Crater on Mars, one of its forward-facing “horns” displaying a sharp, serpentine ridge. The dunes in Arkhangelsky Crater are made of darker-colored material than the surrounding landscape, although the image…