Did you know our solar system might have had an extra planet? Scientists believe a mysterious ninth planet once existed but ...

Our solar system may have a ninth planet after all, following the declassification of Pluto nearly two decades ago, ...

A new study, however, identifies a possible candidate. A separate team of astronomers compared 1983 data from the Infrared ...

Most astronomers agree that life is likely common throughout the universe. While Earth is the only world known to have life, ...

"Rings are mostly made of ice and small rocks," said William Saunders, a planetary scientist at NASA's Langley Research ...

A 9th planet in our solar system might be found — and no, it’s not Pluto - Is there another planet out there? Researchers say ...

Astronomers have detected a promising sign of a ninth planet lurking at the the farthest reaches of the Solar System.

Astronomers may have found a candidate for Planet Nine. This planet is beyond Neptune. The finding could be the first ...

An alternate explanation that fits the evidence is that Vesta was once part of a planet – but which planet that might been ...

but it means it’s not Planet 9,” Brown said. “I don’t think this planet would have any of the effects on the solar system that we think we’re seeing.” Brown’s discovery of Eris ...

A ninth planet the size of Neptune may be hidden in the far reaches of the solar system, but the evidence has left some experts skeptical.