Pluto was downgraded to a dwarf planet by the International Astronomical Union (IAU) in 2006 because it failed to meet the three requirements for the definition of a full-sized planet.
Who originally demoted Pluto?
In a decision to more narrowly define a planet on August 24, 2006, the International Astronomical Union downgraded Pluto from the ninth planet from the sun to a dwarf planet, igniting a scientific and cultural debate.
Pluto was demoted in 2006; why?
Pluto is presently regarded as a dwarf planet because, while being huge enough to have grown spherical, it lacks the power to dominate its orbit and clear the area around it.
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Answer:
2006
Explanation: