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

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

"The singularity is the most mysterious and problematic part of a black hole. It's where our concepts of space and time ...

While solitary black holes should be common, they are hard to find. The one in Sagittarius revealed itself when it passed in front of a dim background star, magnifying the star’s light and slowly ...

Gallagher points to escape velocity to understand the mechanics of a black hole. “If you're on the surface of the earth, and you go straight up, you have to go fast enough so that you can overcome the ...

Astronomers are investigating the longest and most energetic bursts of X-rays seen from a newly awakened black hole. Watching this strange behavior unfold in real time offers a unique opportunity to ...

Supermazes” are theoretical structures that provide a fresh blueprint for understanding the microscopic complexity of black ...

Black holes are massive, astrophysical objects that use gravity to pull surrounding objects into them. Active black holes have a pancake-shaped structure around them called an accretion disk ...

A mysterious black hole in a distant galaxy just woke up after decades of silence—and it’s putting on a cosmic light show! ESA’s XMM-Newton and other X-ray telescopes are capturing massive bursts of ...