What Happens When Two Black Hole Collide?

When two black holes collide, gravity waves make their way to our clever listening devices here on earth. And i think prother's a lot of energy released, and they become one black hole. But odder than that, i think they just merge. I dens and b strongly have stronger gravitational forces, and then it kind of absorbs. They make a lot of gravity waves, and then they make one big black hole.