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An artist's conception of a black hole binary in a heart of a quasar, with the data showing the periodic variability superposed. The central regions of many glittering galaxies, our own Milky Way included, harbor cores of impenetrable darkness—black holes with masses equivalent to millions, or even billions, of suns.
What is more, these supermassive black holes and their host galaxies appear to develop together, or "co-evolve." Theory predicts that as galaxies collide and merge, growing ever more massive, so too do their dark hearts.Image credit: Santiago Lombeyda/Caltech Center for Data-Driven Discovery
