Planet Nine Might Be a Captured Rogue Planet

No rogue planet has been found in the Oort Cloud, but one hypothetical world could be a captured rogue. Planet Nine is proposed to be perhaps 10 times the mass of Earth and 20 times farther from the Sun than Neptune. The evidence is indirect: six known objects in the distant Kuiper Belt have elliptical orbits pointing in the same direction and tilted the same way, about 30 degrees. NASA says the planet could be a fugitive from our own solar system or a wandering rogue planet captured by the Sun’s gravity. Nobody has observed it directly.