Black holes don’t have many identifying features. They come in one colour (black) and one shape (spherical).
The main difference between black holes is mass: some weigh about as much as a star like our Sun, while others weigh around a million times more. Stellar-mass black holes can be found anywhere in a galaxy, but the really big ones (known as supermassive black holes) are found in the cores of galaxies.
Read the full story via The Conversation
