Question

how black hole is formed

Answer 1

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Stellar black holes form when the center of a very massive star collapses in upon itself. Thiscollapse also causes a supernova, or an exploding star, that blasts part of the star into space. Scientists think supermassive black holes formed at the same time as the galaxy they are in.
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Answer 2

scientists think supermassive black hole formed at the same time as the galaxy they are in.