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Pluto was excluded from the list of planets in 2006 after the International Astronomical Union (IAU) released it's decision on what defines a planet. In sum, the IAU now defines a planet as being a celestial body within a solar system that:

1. orbits the sun

2. is large enough to form into a round-ish shape

3. has "cleared the neighbourhood" of it's orbit

Since Pluto did not meet the third criteria, it can no longer be considered a planet.

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