Far beyond Neptune, scientists have found strange orbital behavior that points to something large lurking in the outer solar ...

Astronomers used a telescope in Hawaii to find a new object on the outer edges of our solar system, helping to fuel evidence of a long-standing theory about Planet Nine, or Planet X. For years, ...

Astronomers might have found evidence of a structure located farbeyond Neptune, potentially giving us clues about the solar system’s primordial past. This discovery involves a dense concentration of ...

Scientists have identified a new "superionic" state of carbon and hydrogen that may exist deep inside Uranus and Neptune.

A team of astronomers led by the Center for Astrophysics | Harvard & Smithsonian has discovered a rare object far beyond Neptune, from a class known as trans-Neptunian objects, that is moving in ...

PRINCETON, N.J. (CNN/CNN Newsource/WKRC) — A new planet was possibly discovered beyond the planet Neptune. Researchers from the Institute for Advanced Study's School of Natural Sciences have announced ...

On a frigid orbit beyond Neptune, some of the solar system’s smallest worlds project a strange silhouette. Two rounded lobes, pressed together with a narrow “neck,” like a snowman that never melted.