They twist space itself
A spinning black hole drags spacetime like a whirlpool. In the ergosphere, you cannot stay still.Black Holes: Spin—The Power to Twist Space
Steal a black hole’s energy
The Penrose process—and its magnetic cousin, Blandford–Znajek—can extract rotational energy, likely powering some relativistic jets.Black Holes: Spin—The Power to Twist Space
