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Most definitions that make Pluto a planet would make it Planet Ten, because Ceres would also be a planet.
by OscarCunningham 8y ago
Most definitions that make Pluto a planet would make it Planet Ten, because Ceres would also be a planet.
- mcv 8y agoIn the 19th century, Ceres, Pallas, Juno and Vesta were all considered planets for a while. At some point the solar system had 12 planets. Until people realised it was nuts to consider all asteroids planets. Just like what happened with Pluto upon the discovery of more Kuiper Belt objects.