What is the widely accepted origin theory for Mars's two small moons, Phobos and Deimos?
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Phobos and Deimos, Mars's two irregularly shaped moons, are believed to be captured asteroids rather than having formed with Mars. Their small size, non-spherical shape, and orbital characteristics are consistent with objects pulled in by Mars's gravity from the nearby asteroid belt. Phobos is slowly spiraling inward and is predicted to either crash into Mars or break apart in tens of millions of years. Photo: NASA / JPL-Caltech / University of Arizona, Wikimedia Commons, Public domain.
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