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Answer to Question #16495 in Astronomy | Astrophysics for soni sharma

Question #16495
why, the pluto is not one of the eight planets of solar system .
Expert's answer
We called celestial body a planet if:

-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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