Astronomers have discovered a mysterious object called 2017 OF201, an icy body similar to Pluto, orbiting far beyond Neptune in our solar system.
This object has an extremely distant and unusual orbit, being over 1,600 times farther from the sun than Earth at its most distant point.
The discovery challenges the existence of a ninth planet, as 2017 OF201 does not follow similar orbital paths to other distant Trans-Neptunian objects.
The object is estimated to be around 700 kilometers wide, making it one of the largest objects with such a far-reaching orbit, and its detection implies there may be many similar undiscovered objects in the outer solar system.