Bouncing Boulders May Finally Explain How Mars' Ugliest Moon Got Its Stripes
Mars boasts two of the ugliest moons in the Solar System, including Phobos-an oddly shaped, pockmarked moon featuring a distinctive set of stripes. Astronomers have debated the origin of these grooves for decades, but a new computer simulation suggests Phobos' stripes were made by rolling and bouncing boulders"