Question

why was Pluto considered as dwarf planet?​

Answer 1

Answer:

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.”

Explanation:

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Answer 2

Answer:

The orbital paths of Neptune and Pluto cross. This and pluto's stark differences when compared to the outer planets, led to it's reclassification. It is also smaller than other planets..