The basic theory of Planet X was first considered in 1846 following the discovery of Neptune. Many astronomers theorized that there had to be some large terrestrial body further beyond the four gas giants in order to explain the elliptical orbits of the outer two, Uranus and Neptune respectively. The discovery of Pluto damaged this notion, since it does not have enough gravity to significantly alter the orbits of such large planets. Many believe today that Planet X does not exist and have used theoretical physics to explain the orbits of Uranus and Neptune rather that theories that employee ghost planets as major players.
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