For the first time since Pluto was demoted, the idea of a true ninth planet is edging from speculation toward something ...

Scientists think there may be a ninth planet hiding in the distant reaches of the solar system — and a new telescope could finally prove its existence. | Credit: Nicholas Forder for Live Science Deep ...

Far beyond Neptune, something heavy appears to be tugging on the outer solar system, bending the paths of distant icy worlds ...

There have been questions about a mysterious ninth planet in our solar system for nearly a decade. Pluto was unseated as number nine in 2006. Now, a group of international researchers say they may ...

PHOENIX — Arizona State University is searching for the ninth planet in the solar system, and they want you to help find it. Astronomer Adam Schneider with the university’s School of Earth and Space ...

There has been a lot of back and forth about the existence of a mysterious ninth planet, often referred to as "Planet Nine" or even "Planet X." Now, though, researchers say there is likely at least a ...

Subscribe to The St. Louis American‘s free weekly newsletter for critical stories, community voices, and insights that matter. Sign up (CNN) — You might have a replacement, Pluto. There could be ...

Researchers at the California Institute of Technology (Caltech) have found new evidence that further suggests there is a ninth planet in our solar system. Nicknamed "Planet Nine," researchers said ...

(CNN)You might have a replacement, Pluto. There could be another planet in our solar system. Researchers at the California Institute of Technology have found evidence in the outer solar system of an ...