Question

Q3.Our solar system had nine planets, Pluto the ninth planet is no more
considered as a part of our solar system. Find out the reasons and write in brief
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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.”