Phobos, named for the Greek god of fear, is Mars' larger inner moon, discovered alongside its twin Deimos in 1877 by Asaph Hall. As a satellite of the Red Planet, Phobos orbits closer to its parent body than any other known planetary moon.
Phobos, named for the Greek god of fear, is Mars' larger inner moon, discovered alongside its twin Deimos in 1877 by Asaph Hall. As a satellite of the Red Planet, Phobos orbits closer to its parent body than any other known planetary moon.