Stickney Crater is more than nine kilometers wide on Phobos, a Martian moon only about 22 kilometers across. The impact that created it may have nearly broken the moon apart.
NASA's enhanced-color HiRISE image reveals curious grooves, crater-wall streaks and possible freshly exposed material. The low gravity makes the landscape especially strange.
Action: open the image at full resolution and examine the grooves and crater walls. It is an excellent two-minute science and photography detour.
