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 ...

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?

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

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

A new look through decades-old data has unveiled some of the most compelling evidence yet of a hidden ninth planet in the far reaches of our solar system, far beyond ...

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 ...