A planet is a celestial body that is in orbit around the sun, it must have sufficient mass for its self gravity to overcome rigid body forces so that it assumes a hydrostatic equilibrium (nearly round) shape and has cleared the neighborhood around its orbit.
These standards were set forth by the International Astronomers Union.
With the demotion of Pluto from its planetary status, a new classification was created in 2006 for dwarf planets. These celestial objects meet the first two requirements of being a planet, but they do not have the gravitational pull necessary to clear the neighbor, or push/pull away other objects in their orbit.
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