Decoded: How Mars Moon Phobos Got Its Grooves?
The strange grooves criss-crossing the surface of the Martian moon Phobos were made by rolling boulders blasted free from an ancient asteroid impact, suggests a new study. Phobos’ grooves, which are visible across most of the moon’s surface, were first identified in the 1970s by NASA’s Mariner and Viking missions.
While some scientists posited that large impacts on Mars have showered the nearby moon with groove-carving debris, others suggested that Mars’ gravity is slowly tearing Phobos apart, and the grooves are signs of structural failure. To confirm, a team from Brown University in the US designed computer models that showed that boulders ejected from Stickney could have created the puzzling patterns of grooves seen on Phobos.