This icy world, temporarily named 2017 OF201, could be a distant cousin of Pluto — and scientists mean "distant" quite ...

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

It's an evocative idea that has long bedeviled scientists: a huge and mysterious planet is lurking in the darkness at the ...

OF201, a possible dwarf planet with a 25,000-year orbit, challenging theories about Planet Nine and the solar system’s edge.

U.S. astronomers hunting for "Planet Nine" have instead stumbled on what appears to be a new dwarf planet in the solar system's outer reaches.

There’s a new frozen oddball orbiting the Sun, and it’s not your average space rock. It’s a planet—a minor one, to be ...

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

A potential new dwarf planet has been discovered in the outer reaches of the solar system, and its existence poses the ...

Scientists hunting for the hypothetical Planet Nine have discovered a potential new dwarf planet, 2017 OF201, in the outer ...

Astronomers have identified a new trans-Neptunian object, 2017 OF201, located far beyond Pluto. Its enormous size, comparable ...