Pluto was the smallest planet in our solar system till 2006.Why is Pluto no longer considered a planet? find out!!
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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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