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.

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 ...

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

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 ...

Active black holes have a pancake-shaped structure around them called an accretion disk, which contains hot, electrically charged gas. The plasma that makes up the accretion disk comes from farther ...

"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 ...

Is the Universe inside a Black Hole? The spins of some early galaxies could be a clue that the entire observable universe exists within a black hole—except, that is, for all the evidence to the ...