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when i studied about black hole,the very first thing came into my mind was about it's formation,and how does it look.but here to my knowledge gravity does not work.if a star is more massive than our sun,it has mass called critical mass,which is large enough for the formation of black hole.There is intense pressure caused by nuclear reaction within the sun that results in collapsing of star into black hole.Actually nuclear fuel that feeds nuclear reaction are used up which can't further support this massive body,leads into formation of black hole