For years, scientists have been scanning the icy outskirts of our Solar System for an unknown massive planet. The ...

Discover the mystery of Planet Nine, the elusive celestial body beyond Neptune. Explore the latest astronomical evidence and ...

If Planet 9 is real, this observatory has around a 70 to 80 percent chance of finding it, he estimates, adding that it's not a sure thing because there are so many uncertainties.

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

In searching for the elusive Planet Nine, researchers instead turned up a different resident in our cosmic backyard. A composite image of the five dwarf planets recognized by the International ...

Planet Nine is a hypothetical planet, first theorised by astronomers from California Institute of Technology (Caltech) back in 2016. Said to have a mass about five to 10 times that of Earth, this ...

New research shows there is at least a 40% chance of the existence of Planet Nine, but scientists are still looking for definitive proof.

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 ...

The candidate for Planet Nine displayed a tiny amount of movement, which could mean it advanced further in its orbit around the sun. Some of the strongest evidence that points to the existence of ...

But a Planet Nine would nudge the closest part of 2017 OF201’s trajectory inward until Neptune flung it out of the solar system. That would happen pretty quickly, within about 100 million years.

If Planet 9 is on the smaller side, dark, and really far away, he explains, "it's going to be on the edge of Vera Rubin detection, and Vera Rubin may not find it." ...

But even if it doesn't spot Planet 9 directly, the Rubin Observatory might find some more minor planets, ones whose orbits might be affected by Planet 9. And that could provide additional evidence ...