It's a Fine Line Between a Black Hole Energy Factory and a Black Hole Bomb

You might be surprised to learn there's a way to extract enormous energy from a rapidly spinning black hole. Known as the "Penrose Process," an advanced civilization would feed material into a black hole and extract energy as some of it is hurled into space. A new paper suggests that the process could be even more efficient, cycling the material back into the black hole for another round. Or maybe this will turn into an extremely powerful bomb. The post It's a Fine Line Between a Black Hole Ener...