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Spectra for Quasars Pinpoint the Birth of Light

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Using the spectra from distant quasars taken by a 10-m telescope at W.M. Keck Observatory atop Mauna Kea, Hawaii, two teams of astronomers have suggested that the so-called cosmic Dark Ages came to an end approximately 900 million years after the big bang. The Dark Ages refer to a time in the history of the universe in which atomic hydrogen, formed from free electrons and protons approximately 300,000 years after the big bang, absorbed all light from the newly forming protogalaxies. Over time, ultraviolet light reionized the atomic hydrogen and allowed light to travel freely. One team,...Read full article

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    Published: November 2001
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