Black-Hole Dyson Spheres: Harvesting Accretion Disks, Coronae, and Jets to Advance Civilizations Toward Kardashev Type III
To the point
Freeman Dyson’s idea envisions a swarm of energy collectors arranged around a black hole to tap mainly the accretion disk, corona, and relativistic jets, enabling a civilization to advance from Type II to Type III on the Kardashev scale, with SETI looking for excess infrared heat around such black holes as a telltale signature.
