Astronomers have narrowed down on the possible location in the Solar System where the elusive planet nine may be hiding, an advance that could shed more light on the evolution of our abode in the ...

Legend has it that somewhere beyond Neptune and Pluto, there is a ninth planet, with a mass that is five times greater than ...

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 ...

On August 24, 2006, our solar system lost a planet. It wasn't by cataclysmic destruction, but rather by the vote of the International Astronomical Union, which declared that Pluto, considered the ...

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 ...

Astronomers have discovered icy rocks in the outer solar system that challenge the known laws of physics, suggesting the ...

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 ...

The solar system may have a ninth planet after all. This one is 5,000 times bigger than outcast Pluto and billions of miles farther away, say scientists who presented "good evidence" for a ...

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 ...

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 ...

FILE - Artist's concept of a hypothetical planet orbiting far from the Sun. Nicknamed "Planet Nine," researchers said that the most recent data shows something big is able to pull objects from outer ...