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Black hole - Wikipedia

A black hole is a region of spacetime where gravity is so strong that nothing—no particles or even electromagnetic radiation such as light —can escape from it. The theory of general relativity predicts that a sufficiently compact mass can deform spacetime to form a black hole..

What Is a Black Hole? | NASA

A black hole is a place in space where gravity pulls so much that even light can not get out. The gravity is so strong because matter has been squeezed into a tiny space. This can happen when a star is dying. Because no light can get out, people can't see black holes. They are invisible..

black hole | Definition, Formation, & Facts | Britannica

Black hole, cosmic body of extremely intense gravity from which nothing, not even light, can escape. A black hole can be formed by the death of a massive star..

What Is a Black Hole? - National Geographic

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..

Black Holes | Science Mission Directorate

Don't let the name fool you: a black hole is anything but empty space. Rather, it is a great amount of matter packed into a very small area - think of a star ten times more massive than the Sun squeezed into a sphere approximately the diameter of New York City. The result is a gravitational field so strong that nothing, not even light, can escape..