Crater ejecta on old ripples

A Piece of Mars: Mars rarely does anything without drama. Long ago in this 0.96×0.54 km (0.6×0.34 mi) scene, large ripples formed and then, presumably, lithified (turned into rock). Some time after that, an impact formed the crater in the center, throwing debris into an ejecta blanket that covered the lithified ripples. That ejecta blanket

Dunes on crater bones

A piece of Mars. The dark circle (~170 m across) in the middle of the picture is the interior of what used to be a crater. It’s now almost completely eroded away, probably by the wind. Small dunes have formed on these former crater sediments — because the dunes seem to form mostly on this

Distances to Mt. Sharp

A piece of Gale crater, Mars: Last week NASA released an image from Curiosity showing various distances on the path to Mt. Sharp. I decided to go and see if I could find where they are in spacecraft images. On the right is a CTX image showing the area, with what I think are the