Pluto was disqualified as a true planet in 2006 by the IAU due to not meeting the orbital clearing criterion for planetary classification.
In 2006, the International Astronomical Union (IAU) redefined the criteria for planetary classification. According to the new definition, a celestial body must meet three criteria to be considered a planet:
Pluto met the first two criteria but failed to meet the third one, as its orbit overlaps with the Kuiper Belt, making it a dwarf planet instead of a full-fledged planet.
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