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Quasars Emit Significant Amounts of Radiation from the Lyman α

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Quasars emit significant amounts of radiation from the Lyman α transition.When the spectrum is observed on Earth,it is found that the Lyman α line is accompanied by many absorption lines,called the Lyman α forest.What is the origin of these lines? (See Figure 13-57,Comins,Discovering the Essential Universe,6th ed.)


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