Black holes don’t have many identifying features. They come in one color (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.
Egg-shaped galaxies may be aligned to the black holes at their hearts, astronomers find
