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ieGod@lemmy.zip ⁨10⁩ ⁨hours⁩ ago

It’s not vague at all. It’s a classification that needs to meet three criteria. The lack of this classification is why it was taught that pluto was a planet, but once these things were formalized in 2006 it became clear that pluto no longer met the criteria.

en.wikipedia.org/wiki/IAU_definition_of_planet

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