NASA says "cross-bedding" in the layers of this Martian rock is proof that water moved on Mars, leaving waves or ripples of loose sediment. The image is from a site at Mount Sharp that NASA calls "Whale Rock."
This view combines several frames taken by the Mast Camera (Mastcam) on NASA's Mars rover Curiosity, looking into a valley to the west from the eastern side of a dune at the eastern end of the valley.
A photo composed of nearly 900 images taken by the rover Curiosity shows a section of Gale Crater near the equator of Mars. The rovers are continuing to work through the U.S. government shutdown.