Unknown Planet in the known Solar System

Could there be a tenth planet beyond Pluto?  Neptune was “discovered” on paper in 1846, a year before it was seen; its orbit was calculated from its gravitational effect on the orbit of Uranus. But it did not seem to explain all the disturbance of Uranus that was observed and the search for other planet began. It was not until 1930 that Clyde Tombaugh discovered Pluto. Pluto does not seem to be massive enough to be responsible for all the gravitational disturbance of Uranus and Neptune that has been observed, and at least one more planet may lie beyond Pluto.

Computer analysis of the orbits of Uranus and Neptune gives some “best bets” for the distance and mass of possible planets, some predictions indicate a planet up to five times the mass of the Earth, several times as far from the Sun as Neptune, and possibly in a tilt orbit.

The existence of Charon was not suspected until 1978, when a small bump was noticed on Pluto’s image on a photographic. From 1985 to 1990, Charon’s orbit was positioned so that the satellite passed repeatedly in front of and behind Pluto. This revealed a great deal about both bodies. They both revolve about their common centre of gravity, a point in space between them. Likewise there is definitely more chances for another planet in the Solar System.