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There are a few factors that define a planet, including a minimal size, that it orbits the Sun, and that it has cleared out and dominated its orbit. A dwarf planet is one which meets the other requirements, but has not dominated its orbit. Ceres and Vesta share their orbit with the main Asteroid Belt between Mars and Jupiter; while Pluto, Quaoar, Sedna, and Xena share their orbits with other pieces of the Kuiper Belt.

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14y ago

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