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 ...

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

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

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 ...

Researchers say they found a curious dot on infrared images taken 23 years apart that seems to be moving in a manner ...

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.