BLACK HOLES
It may be that in almost every galaxy, in the center of every galaxy, there's an extremely massive black hole.
Black Holes
Stellar Mass Black Holes
How Do Massive Black Holes Grow?
The second type of black hole to be discovered had some of the same characteristics as stellar black holes.
At the center of many galaxies stars telescopes like Hubble could see stars and gas that were being whirled around a region where there was immense gravity condensed into a tiny space.
Andrea Prestwich
Astrophysicist
Harvard-Smithsonian Center for Astrophysics
Explains the difference between supermassive, stellar and mini black holes.
Explains how stellar mass black holes are formed.
An explanation on the growth of massive black holes.