Einstein believed that black holes didn't really exist. But they do: that much we know. We don't know much else about them.

When two enormous black holes collide in deep space, they send shockwaves rippling across the universe. These shockwaves, called gravitational waves, bend and stretch the fabric of space itself.

Most people know that black holes are kind of scary. Admittedly, that's true, but black holes are so much more than that.

Buonanno's division on the prediction of the gravitational waves that are generated when black holes collide. Albert Einstein predicted the existence of gravitational waves 100 years ago. These tiny ...

Extreme cosmic events such as colliding black holes or the explosions of stars can cause ripples in spacetime, so-called gravitational waves. Their discovery opened a new window into the universe.

Extreme cosmic events such as colliding black holes or the explosions of stars can cause ripples in spacetime, so-called ...

A huge international team of scientists have just announced the discovery of yet another gravitational wave signal sent out by the violent collision of two black holes circling each other 3 ...

WATCH: Here’s the first image of the black hole at the center of our galaxy The world got a look Thursday at the first wild but fuzzy image of the supermassive black hole at the center of our ...

When two galaxies collide and merge, gas is funneled into the central region of that merger. Some of that gas ends up getting close to the newly merged black hole and forms the accretion disk.

"The singularity is the most mysterious and problematic part of a black hole. It's where our concepts of space and time literally no longer make sense." A team of scientists has developed a recipe ...

Primordial black holes are the earliest black holes thought ... but create gamma rays when they collide with each other and self-destruct. So, what could have happened to massless Hawking relics?