What Are Supermassive Black Holes? - Worldatlas.com

These black holes are called supermassive black holes, and they can be anywhere from a million times the mass of the sun to over 100 billion times the mass of the sun.

Black holes are among the largest, most massive objects in the universe. A black hole is defined as any object whose gravitational pull is so strong that not even light can escape, hence why they are… [+3144 chars]

full article...