If Planet Nine is real, it wouldn’t be the first planet discovered from the force it exerts on other objects. In 1846, scientists knew another world must be out there due to the anomalies found ...

Astronomers have searched for the planet but have found nothing. This has led some to speculate that Planet X might be a primordial black hole, while more skeptical minds argue it must not exist.

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

The new research also undercuts some of the more fringe Planet Nine theories—like the idea that it’s a primordial black hole—since the apparent object is emitting light in the infrared.

Planet Nine, according to Batygin, ... such as a primordial black hole — created just after the big bang — that our solar system captured as it moved across the galaxy.

If Planet Nine is real, “my instant reaction might be relief,” Brown says. He admits that should he not be the one to first cast eyes on it, he would feel an initial gut punch of frustration ...

A final transmission sent from Angel's Venture at 5:07 AM PST warned its citizens to evacuate the planet immediately. By 6:39 AM, all signals were lost. Players who jumped into Helldivers 2 when ...

Our solar system used to have nine planets. Astronomer Mike Brown, also known as “the man who killed Pluto,” said he got hate mail from kids and obscene calls at 3 a.m. for years after his ...