Astronomers have announced the discovery of a new dwarf planet in our solar system, named 2017 OF201. Located far beyond Neptune, it orbits the sun every 25,000 years.

Just when you thought you knew all the worlds in the solar system, astronomers go and discover a new object that could rewrite the space map. This icy world, temporarily named 2017 OF201, could be ...

In the cold, distant reaches of the Solar System, far beyond Pluto, astronomers have just identified what could be a new dwarf planet.

Our solar system may have a ninth planet after all, following the declassification of Pluto nearly two decades ago, researchers say.

Pluto, Eris, and the Dwarf Planets of the Outer Solar System ...

Scientists have discovered a new dwarf planet candidate far beyond Pluto in the solar system. Its existence could mean there's no Planet 9.