Black holes result from collapsed stars from "summary" of A Breif History of Time and the Universe in a Nutshell by Stephen Hawking
When a massive star runs out of fuel, it can no longer support its own weight against the force of gravity. The star then collapses under its own gravitational pull, leading to the formation of a black hole. As the star collapses, its outer layers are blown away in a massive explosion known as a supernova, leaving behind a small, dense core. This core then continues to collapse until it becomes a singularity – a point of infinite density and zero volume. The gravitational pull of the singularity is so strong that not even light can escape from it, hence the name "black hole". The boundary surrounding the singularity is known as the event horizon, beyond which nothing can return. Anything that crosses the event horizon is pulled inexorably towards the singularity, with no chance of esc...
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