I have read the there is a black hole in every spiral galaxy
Kindly refer to the link below:-
https://www.meritnation.com/ask-answer/question/as-per-books-i-have-read-about-universe-i-have-mostly-foun/the-universe/8748319
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https://www.meritnation.com/ask-answer/question/as-per-books-i-have-read-about-universe-i-have-mostly-foun/the-universe/8748319
Regards