Why Every Black Hole Out There Is Spinning

The final black hole has to be spinning. Every black hole out there in the universe is almost certainly spinning for that reason. Two black holes spinning around each other have a lot of angular momentum, and they're going to generate a lot of gravita radiation. Thes so much energy released in these collisions that sometimes they can lose a lot of mass, like as much mass as our sun rite. Black holes can evaporate. They can lose their mass through hawking radiation and get smaller and smaller. If they also lose energy by gravitational radiation, they are also getting smaller.