Both are thought to be captured asteroids due to their size and irregular shape.
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Mars has two moons - Phobos and Deimos - which are thought to be captured asteroids. Phobos orbits at a little over 9,000 kilomteres from Mars and Deimos at about 23,500. Phobos has a mass of...
Mars has two very small rocky moons called Deimos and Phobos. The name Mars is associated with the Roman god of war; his hounds were Fear and Panic, Deimos and Phobos.