Active galaxies are thought to be the supermassive cousins of binary systems in our Galaxy that contain black holes. Observations of an unusual active galaxy provide compelling evidence that these systems are indeed related.
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Uttley, P. Heartbeat of an active galaxy. Nature 455, 294–295 (2008). https://doi.org/10.1038/455294a
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DOI: https://doi.org/10.1038/455294a
