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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This is the time of year that we note annual events. Whether it is the human holidays or the astronomical phenomenon of nature, winter solstice, the beginning of earlier sunrises or perihelion (the ...