Active galactic nuclei are supermassive black holes at the center of certain galaxies. As matter falls into these black holes ...

Besides stars, the United States Navy uses quasars as beacons. Quasars are distant galaxies with supermassive black holes, surrounded by ... X-Ray Flashes from a Nearby Supermassive Black Hole ...

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As far as supermassive black holes go, the one at the center of the Milky Way is relatively sedate. But, even in its supposed quiescent state, Sagittarius A* is prone to the occasional belch or ...