A black hole is a place in space where the gravitational force is so strong that even light cannot escape from it. That’s why people can’t see black holes. The reason behind this tremendous gravity pull is that matter has been squished into a tiny space. When a massive star dies, it leaves behind a small and dense remnant core, thus leading to the formation of black holes. The existence of black holes has been predicted in 1916 by Einstein’s general theory of relativity. Since black holes are invisible, scientists study them by detecting their effects upon the matter present nearby. Some black holes can be as small as the size of an atom.
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