NASA’s Perseverance Mars rover captured this selfie on July 23, 2024, using a mosaic of 62 individual images. To the left of the rover, near the center of the frame, is a rock nicknamed “Cheyava Falls” — a formation that may hold important clues about whether Mars once supported microscopic life. Among NASA’s key objectives is the search for signs of ancient microbial life, and the Perseverance rover was built with this mission in mind. It found remarkable levels of organic carbon, sulfur, oxidized iron, and phosphorus; a chemical mix that, on Earth, could support microbial life. However, the surrounding rock at Cheyava Falls shows no signs of such conditions.