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Answer:

According to the International Astronomical Union, which sets definitions for planetary science, a dwarf planet is a celestial body that -orbits the sun, has enough mass to assume a nearly round shape, has not cleared the neighborhood around its orbit, and is not a moon.

Explanation:

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Answer:

The reason these as well as our moon aren't considered planets or dwarf planets is because their natural satellites of actual planets. They orbit the planet that orbits the sun. So that's why they're not considered planets, even though several are bigger than Mercury.

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