Planet Nine

The furore surrounding the solar system's theoretical 'Planet 9' reached new heights after a University of Michigan researcher discovered evidence that may shed light on the existence of the elusive world beyond Neptune.

NASA now says there is growing evidence for the existence of the mysterious Planet Nine, also known as Planet X and often associated with the doomsday planet Nibiru.
Planet Nine seems to be out there, lurking invisible in the darkest outskirts of the solar system, according to a recent press release by NASA.

Just in time for summer movie season comes news that something huge is lurking out there at the edge of the solar system. It’s really big. It’s never before been detected. It’s warping gravity fields.

An unknown, unseen “planetary mass object” may lurk in the outer reaches of our solar system, according to new research on the orbits of minor planets to be published in the Astronomical Journal. This object would be different from—and much closer than—the so-called Planet Nine, a planet whose existence yet awaits confirmation.

BELGRADE - A planet, believed to be the ninth in our solar system, but which has remained mysteriously elusive to astronomers could be causing the "wobble" in our solar system that causes planets to move at a different angle to the sun, according to new research.

The Solar System has at least two more planets waiting to be discovered beyond the orbit of Pluto, Spanish and British astronomers say.
      
The official list of planets in our star system runs to eight, with gas giant Neptune the outermost.