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The planet Mars has two moons, Phobos and Deimos.
Many researchers are fascinated with trying to know how and where Mars's moons came from and this resulted to two main theories about Mars's moons: Asteroid Capture Theory and Large Impact Theory.
Explorations have been done on the moons of Mars but more information is needed. Yet, researchers believe that an in-situ exploration (sending a probe to land) is needed to grab some soil and rocks for further study.
Mars's moons, Phobos and Deimos, share many characteristics with two types of asteroids common in the belt: C- and D-type asteroids.
Moreover, by the looks of Phobos and Deimos, we can easily assume that they are both captured objects from the Asteroid Belt, that maybe there was a collision that sent them off into the direction where Mars's gravitational pull would confine them.
Many questions still lie with whether they are captured asteroid and their circular orbits over the history of the solar system.
The Large Impact Theory brings upon the idea that Mars has suffered a large collision. Just like how the Earth's moon is the result of an immpact between our infant planet and a planetisimal named Theia.
With this theory, astronomers suggest that the composition of Phobos and Deimos may have originated from Mars itself, so therefore this must have happened, but we can only truly say that up until today this is only a theory.
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