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Pluto was the planet in our solar system that was reclassified as a dwarf planet back in 2006, after the International Astronomical Union (IAU) decided on the features that define what a planet is.

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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