
Black hole - Wikipedia
A black hole is an astronomical body so compact that its gravity prevents anything, including light, from escaping. Albert Einstein 's theory of general relativity, which describes gravitation as the curvature …
What Are Black Holes? - NASA
Sep 8, 2020 · A black hole is an astronomical object with a gravitational pull so strong that nothing, not even light, can escape it. A black hole’s “surface,” called its event horizon, defines the boundary …
Black hole | Definition, Formation, Types, Pictures, & Facts ...
Mar 23, 2026 · What is a black hole? A black hole is a cosmic body of extremely intense gravity from which even light cannot escape. Black holes usually cannot be observed directly, but they can be …
Black Hole - Definition, Formation, Types, and Mysteries
Sep 20, 2025 · A black hole is a region of space-time where gravity is so intense that even light cannot escape once it crosses a boundary known as the event horizon. In other words, its escape velocity …
BLACK HOLE Definition & Meaning - Merriam-Webster
The meaning of BLACK HOLE is a celestial object that has a gravitational field so strong that light cannot escape it and that is believed to be created especially in the collapse of a very 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 Hole 101 - Education
May 31, 2024 · A black hole is a region in space where the force of gravity is so strong, not even light, the fastest known entity in our universe, can escape. The boundary of a black hole is called the event …