The Milky Way galaxy houses 100 million black holes | Science News for Students
https://www.sciencenewsforstudents.org/article/milky-way-galaxy-houses-100-million-black-holes
The Milky Way galaxy houses 100 million black holes | Science News for Students
https://www.sciencenewsforstudents.org/article/milky-way-galaxy-houses-100-million-black-holes