"... we know in particular that for the first 380,000 years of the universe it was filled with a fireball. And we know this for sure because we've seen the fireball. In fact we've seen it , and we've take a photograph of it. This is called the cosmic microwave background radiation, but a much better name for it is the Fireball That Filled the Universe When It Was Much Younger."
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David Tong, Quantum Fields: The Real Building Blocks of the Universe - with David Tong YouTube, 15 February 2017, (quote from 45:33 of 1:00:17).
https://en.wikiquote.org/wiki/Cosmic_microwave_background
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Cosmic microwave background
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