The idea that black holes are located in the center of galaxies is a common misconception. While supermassive black holes are found at the center of most galaxies, not all black holes are located there.

Here's a breakdown:

* Black holes come in different sizes: Black holes can be incredibly massive, like the supermassive black holes found at galactic centers, or relatively small, like stellar-mass black holes formed when massive stars collapse.

* Supermassive black holes and galactic centers: These giant black holes, containing millions to billions of times the mass of our Sun, are indeed located at the centers of most galaxies. The reason for this is not completely understood, but it's thought that these black holes formed very early in the universe and played a crucial role in the formation and evolution of galaxies.

* Stellar-mass black holes and galaxies: These black holes, formed from the collapse of massive stars, can be found scattered throughout galaxies, not just at the center.

So, while supermassive black holes are central to galaxies, other types of black holes can be found elsewhere within them.