Light

When Did The First Light Appear In The Universe?

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When you think about the Big Bang, you probably think it's when everything in the universe first appeared. But in fact, it took a little while for galaxies, planets, and even light to come into being. Fraser Cain explains how long the universe had to wait to turn the lights on in the video below.

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When Did Light Appear In The Universe?

It's called the "era of recombination."

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