A bit of serendipity has given astronomers a surprise view of a never-before-observed event in the birth of a galaxy.
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Quasars are the brilliant cores of remote galaxies, at the hearts of which lie supermassive black holes that can generate enough power to outshine the Sun a trillion times. These mighty power sources are fuelled by interstellar gas, thought to be sucked into the hole from a surrounding 'accretion disc'.
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Quasars are some of the most luminous and distant objects in the universe - and appear to have something in common with ordinary light bulbs, say researchers at the University of Illinois at Urbana-Champaign and at the National Center for Supercomputing Applications.
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