For years, researchers have puzzled over the origins of Phobos and its twin, Deimos. Some have suggested that the moons are former asteroids attracted by Mars’ gravity, as their chemical composition is similar to that of some rocks in the main asteroid belt between Mars and Jupiter. However, computer models simulating this capture process have failed to reproduce the pair’s nearly circular paths around Mars. Another hypothesis suggests that a giant impact, similar to the one that created our Moon, ejected the duo from the Red Planet; however, Phobos has a different chemical composition than Mars, making this scenario unlikely.