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Black holes are celestial bodies existing in space in modern general relativity. The gravity of a black hole is so great that the escape velocity in the event horizon is greater than the speed of light.

19 16, the German astronomer karl schwarzschild got the vacuum solution of Einstein's gravitational field equation by calculation. This solution shows that if a large number of substances are concentrated in a small space, there will be a strange phenomenon around them, that is, there is an interface around the particles-once the "horizon" enters this interface, even light cannot escape.

This "incredible celestial body" was named "black hole" by American physicist john archibald wheeler.

References:

Baidu encyclopedia-black hole