Mars Rover Curiosity captured again an interesting artifact on Mars. The latest image shows what appears to be ancient petroglpyphs engraved in a rock. Petroglyphs (also called rock engravings) are pictogram and logogram images created by removing part of a rock surface by incising, picking, carving, and abrading. Petroglyphs are sometimes easily defined based on … Continue reading Mars Rover Sends Back Picture of Petrogyph