Illustration of a rotating supermassive black hole. The mass of the black hole increases the curvature of spacetime. This curvature has a boundary called the event horizon and is indicated by the outer edge of the grid around the black hole. Matter and light falls towards the black hole and cannot escape once past the event horizon. Computer simulations of the behaviour of black holes show their strong magnetic fields accelerate charged particles which appear as emissions of luminous jets, shown in yellow.