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

The black hole pressures—P S, the outward pressure keeping it inflated from the negative scalar curvature, and P M the inward pressure from self-gravity trying to compress it—are gravitational ...

Black holes are fundamental to the structure of galaxies and critical in our understanding of gravity, space, and time. A ...

Black holes are points in space that are so dense they create deep gravity sinks. Beyond a certain region, not even light can escape the powerful tug of a black hole's gravity. And anything that ...

First, the outer boundary of these cosmic titans is a one-way light-trapping surface called an event horizon, the point at which a black hole's gravity is so powerful that not even light can escape.

A Michigan State University researcher saw X-rays coming from a black hole using the NASA Chandra X-Ray Observatory telescope ...

Q: If the gravity of a black hole is so strong that nothing can escape from it, not even light, how has the Hubble Space Telescope recorded images of gas jets ejected from black holes?

"This rare event provides an opportunity for astronomers to observe a black hole's behavior in real time," said astronomer Lorena Hernández-García.

Black holes are made of matter packed so tightly that gravity overwhelms all other forces. When you pick up a bowling ball, it’s heavy because the matter is densely packed. If you packed more and more ...