A potential new dwarf planet has been discovered in the outer reaches of the solar system, and its existence poses the greatest challenge yet to the hypothesis that a ninth planet lurks far from the ...

That tighter orbit brings it much closer to the sun than previously expected, which means that Planet Nine may appear brighter to Earth-based telescopes.

Despite suggestions the planet could be due to a statistical anomaly and selection bias, the team believes the objects could be moving due to the influence of a large object beyond Neptune's orbit.

Almost a decade after astronomers proposed the existence of Planet 9, an unseen extra planet in the distant reaches of the solar system, they still haven’t all agreed whether it’s real or not.

It just didn’t meet all three criteria for a fully-fledged planet: it must orbit a star (in our Solar System, this would be the Sun) ...

Some experts believe that the solar system's hypothetical ninth planet could be just a few years away from being discovered. If this is the case, how long would it take for humans to send probes ...

No telescope has basked in the night sky quite like the enormous new Vera Rubin Observatory. Here's what it could reveal ...

After a decade-long search, some scientists say a growing number of clues point to the existence of a hidden planet in the Kuiper Belt beyond Neptune — and they may soon have the opportunity to ...

A small team of planetary scientists from the California Institute of Technology, Université Côte d'Azur and Southwest Research Institute reports possible new evidence of Planet 9. They have ...

Is “Planet 9” Out There? Astronomers Find Evidence Of Massive Object Beyond Neptune’s Orbit The team of researchers are calling it the “strongest statistical evidence yet”.