When was Pluto formally downgraded from planet to dwarf planetanswers.com?

Pluto was formally downgraded from planet to dwarf planet on August 24, 2006, during a meeting of the International Astronomical Union (IAU). The IAU established a new definition of what constitutes a planet, which Pluto did not meet due to its inability to clear its orbit of other debris. This reclassification sparked significant debate and discussion within the scientific community and the public.