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IN 2006, the International Astronomical Union voted that a planet must meet three qualifications.

1. It must orbit the Sun, not another body.

2. It must be massive enough to have been crushed into a spherical shape by its own gravity.

3. It must have "cleared the vicinity of its orbit".

Pluto meets the first two criteria, but because there are many other (possibly millions of other) bodies in the Kuiper Belt of assorted mass and debris beyond Neptune, Pluto has not "cleared its orbit" of other bodies. Like Ceres in the Asteroid Belt, Pluto was demoted to "dwarf planet" status.

This third requirement is fairly controversial, as astronomy goes, and the next IAU convention may revise it.

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16y ago

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