Researchers spotted a second distant star orbiting a well-known black hole and its stellar companion in a never-before-seen ...

There's evidence out there for the supernova model of black hole formation. This is when a dying star erupts in a colossal ...

Astronomers have stumbled upon something truly remarkable: a black hole that's not just part of a binary system, but part of ...

A third, tenuously held companion to the known binary V404 Cygni may signal that at least some black holes form "gently." ...

Black holes have previously been spotted orbiting with one other star or one other black hole in what are called binary ...

"Overall, it's not surprising that black holes should be in triples, but what's surprising is that this system held onto the outer star after forming the black hole." ...

When black holes merge, what happens inside of them is anybody's guess. Black hole mergers are beautiful — and some of the most violent events in the cosmos. Here's how the process unfolds.

Black holes have only been spotted on their own or in a binary until this discovery, with a single star, neutron star or other black hole companion orbiting tightly around them. Now, according to ...

Most of the black holes that scientists have detected appear to be part of a pair called a binary system. These systems are made up of the black hole and a secondary object like a star ...

The new system holds a central black hole in the act of consuming a small star that's spiraling in very close to the black hole, every 6.5 days—a configuration similar to most binary systems.