#Black-holes are produced by huge stars. They are called #BLACK-HOLES not because there are real holes in space but because thay cannot be seen as there is no light coming out of them.
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When after burning for billions of years stars reach the end of their lives their energy dose not disappear.
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The burning core becomes veru small like a pinpoint but its weight is as much as a star. It's also has tremendous gravity and this gravity pulls towards it everything that comes near.
picture source : INTERNET