What's the name of the hypothetical ninth planet in the Solar System, which according to two scientists circles the Sun every 15,000 years?

Planet Nine is a hypothetical planet located in the Solar System's outer area. Its gravitational effects may account for the improbable grouping of orbits for a collection of extreme trans-Neptunian objects, which are things beyond Neptune that orbit the Sun. These alignments imply that an unknown planet may be guiding the orbits of the Solar System's most distant known objects.

Asked by Vasilii Kulev · Last updated 4 years ago · 1.6K views · SOURCE