... Tonight's Sky . ... Behemoth black hole found in an unlikely place . Gravitational wave search provides insights into galaxy evolution and mergers . ... galaxies . ... black holes . ... Black holes lead galaxy growth . ... Earlier studies of galaxies and their central black holes in the nearby universe revealed an intriguing linkage between the masses of the black holes and of the central "bulges" of stars and gas in the galaxies. ... Black holes are the rhythm at the heart of galaxies . ...