Space.com #Weird Grooves On Mars’ Moon Phobos Traced to Asteroids 30 August 2016 fborgosano Leave a comment Share: Crisscrossed grooves and chains of small craters cover the Martian moon Phobos. Astronomers have disagreed about what caused this strange-looking landscape for decades, but new research may help settle the debate. from Space.com ift.tt/2c5Gxt5 Share: