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This is from the University of Arizona: http://seds.lpl.arizona.edu/nineplanets/nineplanet s/hypo.html#planetx Planet X was theorized as a possible cause for large deviations in Uranus's orbit. The discovery of Pluto was directly related to this Planet X theory.
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This is from the University of Arizona: http://seds.lpl.arizona.edu/nineplanets/nineplanet s/hypo.html#planetx
Planet X was theorized as a possible cause for large deviations in Uranus's orbit. The discovery of Pluto was directly related to this Planet X theory.