Web1 day ago · Missions to the moons of Mars. Phobos' Stickney Crater. Deimos (lower left) and Phobos (lower right) compared with the asteroid 951 Gaspra. Phobos by Mars Global Surveyor in 1998 [49] There have also have been proposed missions dedicated to explore the two moons of Mars, Phobos and Deimos.