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Black hole - Wikipedia
Black holes typically form as part of a supernova event when massive stars collapse at the end of their life cycle. After a black hole has formed, it can grow by absorbing mass from its surroundings.

Black Holes - NASA Science
A black hole is so dense that gravity just beneath its surface, the event horizon, is strong enough that nothing – not even light – can escape. The event horizon isn’t a surface like Earth’s or even the Sun’s. It’s a boundary that contains all the matter that makes up the black hole.

What Are Black Holes? - NASA
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 where the velocity needed to escape exceeds the speed of light, which is the speed limit of the cosmos.

Black hole | Definition, Formation, Types, Pictures, & Facts ...
Black hole, cosmic body of extremely intense gravity from which nothing, not even light, can escape. It can be formed by the death of a massive star wherein its core gravitationally collapses inward upon itself, compressing to a point of zero volume and infinite density called the singularity.

Black holes — Everything you need to know | Space
Black holes are some of the strangest and most fascinating objects in the universe. They're extremely dense, with gravitational forces so strong, that nothing, not even lights, can escape once...

Black Hole - Definition, Formation, Types, and Mysteries
Explore what a black hole is, how one forms, their types, structure, history, and the latest discoveries about these cosmic enigmas.

Black Holes Coverage | Space
NASA's Roman Space Telescope could reveal black holes ripping up stars. It's set to launch Aug. 30. NASA's next super telescope, the Nancy Grace Roman Space Telescope, may leave nowhere to hide...