There has been a lot of back and forth about the existence of a mysterious ninth planet, often referred to as "Planet Nine" ...

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

Researchers in the US have suggested there is a 40 percent chance a ninth planet could exist in our solar system. Planet Nine ...

Astronomers have been scouring the outer solar system for signs of a hypothetical ninth planet for almost a decade, without success. However, we may finally be on the cusp of finding it, experts say.

Scientists may have discovered a dwarf planet far beyond Neptune — an unearthing that may disprove a longstanding theory ...

However, in April 2025, a new study co-authored by scientists in Taiwan, Japan, and Australia claimed to have found a potential candidate for this formerly hidden ninth planet in two datasets that ...

In February, researchers announced they had narrowed the search field for a hypothetical ninth planet beyond Neptune by nearly 80%, raising hopes that astronomers might soon solve this mystery. GBH's ...

There’s a new object in the distant reaches of our solar system, and it might just offer clues to a long-standing cosmic mystery. Astronomers have cataloged a frozen minor planet called 2017 ...

Why a mysterious ninth planet might be lurking beyond Pluto. A new computer model suggests a world a little larger than our own Earth hides within the distant Kuiper belt. By Briley Lewis.

Pluto was reclassified as a dwarf planet in 2006. Our solar system may have a ninth planet after all, researchers say. The possibility that an additional planet may be hidden far into the solar ...

Pluto was once considered the ninth planet in the solar system. It was demoted in 2006. When you purchase through links on our site, we may earn an affiliate commission. Here’s how it works ...