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What Counts as a Planet?
by Patricia Fara
The scientific disagreement about whether Pluto is a planet is just the latest war in the classifications of planets.
https://www.historytoday.com/archive/great-debates/what-counts-planet
ALT
@gutenberg_org If you could theoretically both stand on the surface, and jump and come back down, its a planet.
So we have Mercury, Venus could become a planet with more advanced tech, Earth, Luna, Mars, Vesta, Ceres, Io, Ganymede, Europa, Callisto, Titan, Reah, Iapetus, Dione, Tethys, Enceladus, Mimas, Titania, Oberon, Umbriel, Ariel, Miranda, Puck (Maybe), Triton, Pluto, Charon, and Eris.
I think there are more beyond that, but we don't really know much about them yet. That makes 26-28 planets.