Leopard Spots on Martian Rocks

Explanation: What is creating these unusual spots? Light-colored spots on Martian rocks , each surrounded by a dark border, were discovered last year by NASA 's Perseverance Rover currently exploring Mars . Dubbed leopard spots because of their seemingly similarity to markings on famous Earth-bound predators , these curious patterns are being studied with the possibility they were created by ancient Martian life . The pictured spots measure only millimeter s across and were discovered on a larger rock named Cheyava Falls . The exciting but unproven speculation is that long ago, microbe s generated energy with chemical reactions that turned rock from red to white while leaving a dark biosignature ring, like some similarly appearing spots on Earth rocks . Although other non-biological explanations have not been ruled out, speculation focusing on this potential biological origin is causing much intrigue .