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

The small world was found during a search for the hypothetical Planet Nine, and astronomers say the next time it will reach ...

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

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

Astronomers find evidence of a possible ninth planet beyond Neptune, reigniting the debate about the formation of the Solar ...

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 ...

The researchers called it one of the most distant visible objects in our solar system, and said its existence indicates that a vast expanse of space beyond the outermost planet Neptune and a region ...

The first observations of Pluto by NASA’s James Webb Space Telescope (JWST) reveal dramatic phenomena on its surface, like ...

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

Cheng, together with graduate students from Princeton University, discovered the potential dwarf planet while searching for ...