KnowraPlanet NineLinked fromLinked fromThe 8 pages that link to Planet Nine, each with the reason it gives.All 8Broader topic 1Related 2Compared with 5Solar SystemRelated: Its existence remains unconfirmed, and searches have not yet found it.Oort cloudCompared with: Its existence and influence could alter models of distant Solar System populations, including the cloud.Trans-Neptunian objectRelated: Its existence remains debated, and the proposed evidence comes from distant objects.Scattered discCompared with: Its proposed influence concerns distant objects, but it is not established as the source of the scattered disc.Hills cloudCompared with: It is another unconfirmed claim about the distant Solar System, but proposes a planet rather than a comet reservoir.Nibiru cataclysmCompared with: Unlike Nibiru, Planet Nine is a testable scientific hypothesis with no claimed imminent passage near Earth.Planets beyond NeptuneBroader topic: It is the best-known proposed planet beyond Neptune, but has not been detected.SednoidCompared with: Its gravitational influence is a debated explanation for the clustering of sednoid orbits.