Question

why the Pluto is known as dwarf planet​

Answer 1

Because it has not cleared the neighborhood around its orbit, Pluto is considered a dwarf planet. It orbits in a disc-like zone beyond the orbit of Neptune called the Kuiper belt, a distant region populated with frozen bodies left over from the solar system's formation.

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Answer 2

Earlier pluto was known as a planet but then in 2006 the international astronomical Union (IAU) adopted a new definition of planet

Pluto does not fit this definition so it is called a dwarf planet

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