Mysterious "Planet Y: Researchers Discover New Clues to Undiscovered Planets in the Solar System

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Strange orbits in the Kuiper belt point to a hidden planet – smaller than the Earth, but with enormous effect on its surroundings.

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Astronomers have collected evidence of a world of Earth size, distinct from the new planet and planet X, which could distort the orbits of objects beyond Neptune Are there invisible planets in our solar system? Somewhere on the edge of the solar system, a new world of size [...]

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Again, there are signs of another planet of our solar system that is different from all the previously proposed ones.