In the cold, dark outskirts of planetary systems far beyond the reach of the known planets, mysterious gas giants and ...

Astronomers have discovered a mysterious dwarf planet, 2017 OF201, far beyond Pluto. This discovery challenges existing ...

Astronomers have discovered a new dwarf planet, named 2017 OF201, far beyond Pluto's orbit. It takes 25,000 years to orbit ...

A new member of the solar system has been detected, the second-largest of its kind, suggesting there may be more like it ...

There’s a new object in the distant reaches of our solar system, and it might just offer clues to a long-standing cosmic ...