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Astronomers have been looking for "Planet X" since 1846, when Neptune was discovered. Many theories have been tested and discarded. The discovery of Pluto was thought to be Planet X, but that was also discarded. The basis for the theory of Planet X's existence is based on perturbation of the orbits of the outer planets, and on some of the asteroids. At this point in time, there is general consensus that there is no Planet X. For more information, please see the Related Link below.

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