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Generally, Planet X is an undiscovered planet in our solar system. Pluto was "Planet X" until it's discovery in 1930. Scientists postulate the existence of a Planet X by noting irregularities in the orbits of other planets. Now, Pluto and anything past it discovered so far are known as dwarf planets. There maybe another planet somewhere past Pluto, but I believe Planet X now refers to extra-solar planets.

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13y ago

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