Why Is Pluto Not a Planet Anymore?

For 76 years, Pluto was the ninth planet. We trace its 1930 discovery, the Kuiper Belt, the discovery of Eris, and the 2006 vote that made Pluto a dwarf planet, along with the debate that still continues. Then we follow New Horizons' 2015 flyby, which showed a far more surprising world than anyone expected.This episode includes AI-generated content.