The two moons of Mars are Phobos and Deimos.[1] They are irregular in shape.[2] Both were discovered by American astronomer Asaph Hall in August 1877[3] and are named after the Greek mythological twin characters Phobos (fear and panic) and Deimos (terror and dread) who accompanied their father Ares into battle. Ares, the god of war, was known to the Romans as Mars.