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 ...

Astronomers may have uncovered a potential candidate for the elusive Planet Nine, a hypothetical planet located ... they narrowed the list down to just one candidate. This object was found to ...

The newcomer replacing Pluto presently goes by “Planet Nine.” If and when it finally shows up, it will get the honor of a real name, but so far, the evidence for this hypothetical planet is ...

Jess Thomson is a Newsweek Science Reporter based in London UK. Her focus is reporting on science, technology and healthcare. She has covered weird animal behavior, space news and the impacts of ...

If the James Webb Space Telescope can see galaxies billions of light-years away, why can’t it find the proposed Planet X somewhere in our solar system beyond Pluto? Your excellent question ...

Breakthroughs, discoveries, and DIY tips sent every weekday. Terms of Service and Privacy Policy. Almost a decade after astronomers proposed the existence of Planet 9 ...

More evidence for a hypothetical extra planet lurking in the most distant reaches of our solar system has come to light — and the clues are associated with icy bodies that cross the orbit of ...