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In Cartoons (and in science), wasn't this called Planet X and in other hypothesis 'Nemesis'? I get that Pluto was demoted, but it's still a planet, if dwarfish

by mc32 5y ago

In Cartoons (and in science), wasn't this called Planet X and in other hypothesis 'Nemesis'? I get that Pluto was demoted, but it's still a planet, if dwarfish, so it should still be Planet X (X as in ten, but X can also mean undetermined number, which is perfect).

dragonwriter 5y ago
> In Cartoons (and in science), wasn't this called Planet X and in other hypothesis 'Nemesis'? Nemesis is a hypothetical star, not Planet 9/X, explaining different phenomena; it would be farther out. But, yes, Planet 9 is more recent name for the same hypothetical object as Planet X: https://solarsystem.nasa.gov/planets/hypothetical-planet-x/in-depth/ https://solarsystem.nasa.gov/planets/hypothetical-planet-x/i...