Last week, the Planetary Society’s Red Rover Goes to Mars Student Scientists made planetary exploration history. They were the first members of the public to direct a camera aboard a spacecraft orbiting another world, the NASA Mars Global Surveyor (MGS). One of the pictures they targeted shows something new about the planet’s surface — a surprising cluster of dark-colored boulders smack dab in the middle of light-colored terrain. How the boulders got there and what geological history they represent on Mars are questions scientists still need to answer.