For many years, astronomer Percival Lowell searched for a "Planet X" that might explain some of thein the orbit of Uranus

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For many years, astronomer Percival Lowell searched for a “Planet X” that might explain some of the perturbations observed in the orbit of Uranus. These perturbations were later explained when the masses of the outer planets and planetoids, particularly Neptune, became better measured (Voyager 2). At the time, however, Lowell had proposed the existence of a Planet X that orbited the Sun with a mean distance of 43 AU. With what period would this Planet X orbit the Sun?

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