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Planet X is the theorized, but unconfirmed, "10th" planet in our solar system (when we had 9 planets total and Pluto was still considered a true planet). This elusive "Planet X" was thought most likely to be a gas giant and probably the cause of Pluto's off-planar orbital tilt. It was also thought to be the cause for some strange behavior with Neptune in respect to the other gas giants. In fact hunting for "Planet 9" was why Pluto was discovered in the first place. It soon became apparent, however, that Pluto was not "massive" enough to have caused the anomalies with Neptune - hence the hunt for Planet X.

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14y ago

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