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 ...
Berkshire Hathaway Inc. Cl A-0.03% $1.01T Berkshire Hathaway Inc. Cl B 0.13% $1.01T ...
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