Astronomers from the California Institute of Technology (CIT) have found evidence to suggest our solar system has a ninth planet, and no, it's still not Pluto.

This planet, which they've called "Planet Nine" for now until they come up with something better, is thought to be five to ten times the size of Earth. It orbits the sun once every 10,000 to 20,000 years.

The planet has not been directly observed by the CIT team, consisting of astronomers Michael Brown and Konstantin Batygin. But the existence of it is assumed by unusual movements of dwarf planetoids in the outer solar system, influenced by the gravity coming off this unseen planet.

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