Mars has two moons: Phobos and Deimos (which respectively mean "Fear and "Panic" in [[Greek]]). Russian scientists in the 1950s posited that Phobos might be hollow, but these claims were discredited in the late 1960s. | Mars has two moons: Phobos and Deimos (which respectively mean "Fear and "Panic" in [[Greek]]). Russian scientists in the 1950s posited that Phobos might be hollow, but these claims were discredited in the late 1960s. |