The International Astronomical Union (IAU) had a vote which was very close. They defined three criteria which a planet must satisfy.

- It must be large enough for gravity to overcome structures of materials and make it spherical. Most bodies are flattened spheroids due to rotation.

- It must orbit the Sun.

- It must have cleared its orbit of other bodies other than moons.

The IAU created a... more

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James Vardini
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