What are the main differences between stellar black holes and supermassive black holes?

While stellar black holes are much smaller, measuring between 20 and 100 miles across, and they roam the empty space of space consuming stars, supermassive black holes remain in the center of galaxies, holding them together. Supermassive black holes are enormous, with a potential diameter of nearly 2 billion miles.

The primary distinctions between supermassive and stellar black holes are their mass, size, and location within galaxies. Supermassive black holes are found at the centers of galaxies and have masses that range from millions to billions of times that of the Sun. Stellar black holes are formed from the collapse of massive stars and typically have masses ranging from a few times that of the Sun to tens of times that of the Sun. Stellar black holes are relatively small, with diameters of only a few kilometers, while supermassive black holes have diameters that range from millions to billions of kilometers. Finally, supermassive black holes are typically located within galaxies, while stellar black holes are found outside of them.