Question

why pluto is not considered as planet??​

Answer 1

Answer:

It is because it is a dwarf planet.

Explanation:

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.”

Answer 2

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Pluto was discovered because Neptune’s orbit showed an anomaly that indicated that there was something else out there. So they looked and eventually Clyde Tombaugh discovered Pluto.

Right from the start, Pluto was a weird one. Its orbit was not on the plane of the solar system, and it crept inside Neptune’s orbit from time to time. As we got better telescopes in the 1970s, we found Pluto’s moon Charon. And from that it was possible to estimate Pluto’s mass with some accuracy. It was a lot smaller than expected. So, astronomers started to look for other things out there. Ceres was already known, but it was stuck in the asteroid field and thus sort of ignored.

In the mid 1990s, astronomers began to discover a lot of new things out there, in the outer solar system. They were planet-like and small, like Ceres, but they had weird orbits, like Pluto. By the mid-2000s, they had discovered Eris, Sedna and Quaoar.