Question

Until 24 August, 2006, Pluto was
considered as the ninth planet of the Solar
System. Now, Pluto has been categorised
as a Dwarf planet.​

Answer 1

Answer:

Because if was entering another planets orbits leaving its orbit.

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Answer 2

Answer:

Because Pluto does not fulfill all requirements of a planet.

For example,

Planets revolve around their sun in a proper circular orbit.

But Pluto changes its orbit and does not have any proper orbit.