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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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Starr, who is Black, said she told the care team about research showing that the devices, which measure oxygen levels in the blood, may not work as well on people with darker skin and potentially ...