The Cloverleaf quasar (H1413+117, QSO J1415+1129) is a bright, gravitationally-lensed quasar. == Quasar == Molecular gas (notably CO) detected in the host galaxy associated with the quasar is the oldest molecular material known and provides evidence of large-scale star formation in the early universe. Thanks to the strong magnification provided by...
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http://en.wikipedia.org/wiki/Cloverleaf_quasar
(H1413+117) Chandra X-ray view of the Cloverleaf quasar. Credit: NASA/CXC/Penn State/G.Chartas et al A quasar, discovered in 1988 and located about 11 billion light-years away in Leo, that appears as four different images because of a gravitational lens effect caused...
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http://www.daviddarling.info/encyclopedia/C/Cloverleaf_Quasar.html
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