Scientists have formed 3 criteria to define a planet.
They are -----
1. It must orbit around the Sun.
2. It must have enough mass to draw itself into a round shape.
3. It must have cleared all other celestial bodies, exept its own moons, from its orbit.
Based on the third requirement, scientists declared that Pluto is no longer qualified as a planet.
Because of its position in cluttered Kuiper belt, where thousands of objects sits beyond the orbit of Neptune, Pluto is not gravitationally dominant object in iits neighborhood.
Thus Pluto is not a planet.
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