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

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 ...

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

In searching for the elusive Planet Nine, researchers instead turned up a different resident in our cosmic backyard.

If Planet Nine is finally discovered, as one of those who first postulated its existence, does Brown have any suggestions for a possible formal name for this new member of the solar system?

Researchers from Rice University claim to have fresh evidence of Planet Nine - as well as a method to find it.

Science | NPR If Planet Nine is out there, this telescope might actually find it A powerful new observatory is the best hope yet for finding the elusive Planet 9, a large planet that some ...