The location of this planet was not determined by these models. "One inevitable effect of Planet Nine, if it exists, is to ...

Researchers found a remarkable correlation between the meteorite’s source and the predicted position of Planet Nine. These results are consistent with the “messenger hypothesis”, according to which ...

Growing up, I was taught that there were nine planets in the solar system. That all changed in 2006, when the International Astronomical Union voted to demote Pluto's status to that of dwarf planet.

Known as Planet Nine or Planet X, it is a hypothetical planet that has long been rumoured to exist in the outer solar system. Although "several claims to have found an extra planet have been made ...