Astronomers glimpse cosmic dawn, when the stars switched on

This image provided by the National Science Foundation shows a rendering of how the first stars in the universe might have looked. Scientists have detected a signal from 180 million years after the Big Bang when the earliest stars began glowing. The findings were published on Wednesday, Feb. 28, 2018 in the journal Nature. (N.R.Fuller/National Science Foundation via AP)

This image provided by the National Science Foundation shows a timeline of the universe. Scientists have detected a signal from 180 million years after the Big Bang when the earliest stars began glowing. The findings were published on Wednesday, Feb. 28, 2018, in the journal Nature. (N.R. Fuller/National Science Foundation via AP)

WASHINGTON — After the Big Bang, it was dark and cold. And then there was light. Now, for the first time, astronomers have glimpsed that dawn of the universe 13.6 billion years ago when the earliest stars were turning on the light in the cosmic darkness.

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