They also think it would take the planet between 10,000 and 20,000 years to make just one full orbit around the sun. The sun’s axis is on a slightly different plane to all the planets.

Could the effects of a hypothetical "Planet Nine" which astronomers have been searching for since 2016 actually be caused by a black hole lurking on the edge of the solar system?

More evidence for Planet Nine: Bizarre orbits of distant objects could be explained by the hypothetical world. Astronomers said in January they may have discovered a ninth planet ...

The small world was found during a search for the hypothetical Planet Nine, and astronomers say the next time it will reach its closest point to the sun is in the year 26186.