Astronomers have confirmed a Saturn-size world drifting alone in deep space roughly 10,000 light-years from Earth, a discovery that turns a once-theoretical idea into a measured reality. The planet ...

Just because Pluto was ruled out as a planet in 2006 doesn’t mean our solar system only has eight planets. The search for Planet Nine is far from over as scientists continue to uncover clues ...

For the first time, astronomers have managed to weigh a planet that is not bound to any star, a lonely world drifting through ...

Scientists have measured that Jupiter releases more internal heat than it absorbs from the Sun, based on observations of its structure, rotation, and atmospheric behavior.

Astronomers have finally pinned down the mass and distance of a lonely world that drifts through the galaxy without a parent ...

Astronomers have, for the first time, pinned down both the mass and distance of a planet that drifts through the galaxy ...

Astronomers have been scouring the outer solar system for signs of a hypothetical ninth planet for almost a decade, without success. However, we may finally be on the cusp of finding it, experts say.