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?

The mystery of whether there is an undiscovered planet at the edge of our solar system is one that has gripped the imagination of astronomers since the start of this year. Dubbed 'Planet Nine' by ...

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. By Kenneth Chang ...