Some black holes are way bigger than we can explain, and they may have come from supermassive stars that formed by devouring the other stars around them
Source:
https://www.newscientist.com/article/2239472-supermassive-stars-may-have-formed-by-repeatedly-eating-their-siblings/?utm_campaign=RSS%7CNSNS&utm_source=NSNS&utm_medium=RSS&utm_content=home