The basic answer is that since we’ve discovered Pluto, we have also discovered hundreds of other tiny planets in our solar system that are around the same size as Pluto.
If we keep Pluto as a planet, we then have to add hundreds more planets to our official list. Many scientists feel that’s just not a good idea, and felt that we should instead move Pluto to a different category along with the rest of those tiny planets we found.
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