While scouring a 50-million-year-old crater on Mars, the Curiosity rover stumbled upon a polygon-shaped pattern that sort of looks like a giant reptile had shed its skin across the planet’s surface. The rover’s recent find adds to the long list of weird and eerie images of the alien world.

NASA’s six-wheeled robot captured the photo of the strange rocks on April 7 while driving toward a small crater named Antofagasta. “Many of the rocks we’ve driven over have these incredible textures—thousands of honeycomb-shaped polygons crisscross their surface,” Abigail Fraeman, deputy project scientist at NASA’s Jet Propulsion Laboratory, wrote in a blog post.

This image was taken by Mast Camera (Mastcam) onboard NASA’s Curiosity rover.…