Following the Big Bang, the Universe was hot and dense, composed of a soup of elementary particles. But after 400,000 years, the cosmic soup cooled below 4000 degrees Kelvin and electrons and protons…

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The post discusses the process of cosmic reionization after the Big Bang and how the detection of the Loeb-Rybicki halo can provide information about the neutral hydrogen in the early Universe.

Shining Light on Cosmic Hydrogen