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The short answer is that the decision was ultimately made by the International Astronomical Union, or IAU.

The longer answer is that nobody actually ever decided Pluto wasn't a planet. You see, before August 24th, 2006, there was no official definition of what is and is not a planet. As more differences were noted between Pluto and the other eight planets in our solar system, the need for an official definition became more pressing. Eventually the IAU met and formulated a definition upon which they could all agree. This definition excluded "planets" with characteristics like Pluto has, thus changing its classification from planet to dwarf planet.

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14y ago

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