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Pluto, once embraced as a planet, lost its status due to the defined criteria for planets, which entails that they must orbit a star, have enough mass to be rounded by gravity, and clear their orbits of debris. Accordingly, Pluto was designated a 'dwarf planet' due to its inability to clear its orbital space, a distinction highlighting the intricate delineations within celestial classifications.
In addition to the Asteroid Belt, most solar systems are thinkable to have a Kuiper Belt—an expanse beyond Neptune, filled with icy bodies, many of which could serve as moons. The Kuiper Belt's combined mass dwarfs that of the Asteroid Belt and is an abundant resource for prospective colonization.