What Are Quasars ?
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A quasar is an extremely luminous active galactic nucleus, in which a supermassive black hole with mass ranging from millions to billions of times the mass of the Sun is surrounded by a gaseous accretion disk
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Shining so brightly that they eclipse the ancient galaxies that contain them, quasars are distant objects powered by black holes a billion times as massive as our sun. ... Astronomers called them "quasi-stellar radio sources," or "quasars," because the signals came from one place, like a star.
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