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…

March of the Barchans

Shaped like huge shark teeth, barchan sand dunes coat the floor of Herschel Crater in this false-color image from the HiRISE camera aboard the Mars Reconnaissance Orbiter. (See the full-sized map-projected image here.) Barchan dunes (pronounced “barkan”) are found in many places on Mars as well as on Earth. They are formed by the pile-up…