Question

What are the characteristics of a planet and why pluto is not a planet?

Answer 1

The characteristics of a planet are :

It is in orbit around the Sun.

It has sufficient mass to assume hydrostatic equilibrium (a nearly round shape).

It has "cleared the neighborhood" around its orbit.

And as Pluto does not meet all the 3 criterias it is not considered as a planet.

Answer 2

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The International Astronomical Union (IAU) downgraded the status of Pluto to that of a dwarf planet because it did not meet the three criteria the IAU uses to define a full-sized planet. Essentially Pluto meets all the criteria except one—it “has not cleared its neighboring region of other objects.”

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