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Published online 23 January 2003 | Nature | doi:10.1038/news030120-5
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Dark matter halos found?
Astrophysicists spot solution to puzzle of quasars' quick formation.
Two astrophysicists think they may be able to explain the appearance, long ago, of quasars, which are some of the brightest and most distant objects in the visible universe.
Some quasars emit more energy than a thousand ordinary galaxies.
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