Answer to Question #16495 in Astronomy | Astrophysics for soni sharma
-It orbits around the Sun;
-It has sufficient mass for its own gravity to achieve hydrostatic equilibrium (nearly round) shape;
-It is dominant in its orbit.
Pluto does not meet one of the criteria of the this definition of a planet: the mass of the objects that has the same orbit that are not his satellites is too large compared to the mass of Pluto, to assume that it dominates
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