Is there a massive undiscovered planet on the outer reaches of the solar system? The idea has been around since before the ...

Astronomers have long speculated about the existence of a mysterious planet lurking far beyond Neptune, a world several times ...

Planet Fitness will join a revitalized shopping center that recently added Aldi and Tesla. Leaving its former space makes ...

Planet Nine should appear stationary over the course of a single day but show detectable movement over months.

Astronomers have found 2023 KQ14, nicknamed Ammonite, a rare sednoid with a unique orbit that challenges the Planet Nine ...

Theories about Planet Nine have been swirling for years, but this newly discovery planet might put those theories to bed for good.

Japan's Subaru Telescope in Hawaii detected a faint, icy body. Now named 2023 KQ14, or Ammonite, it lies well beyond Pluto.

Researchers use the Subaru Telescope in Hawaii to find a small object on the outer edge of the Solar System. Nicknamed ...

"It is possible that a planet once existed in the solar system but was later ejected, causing the unusual orbits we see today ...

The celestial body's unusual orbit “implies that something extraordinary occurred" in the early days of the solar system—and ...