Lyman-alpha forest

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What Wikipedia says

In astronomical spectroscopy, the Lyman-alpha forest is a series of absorption lines in the spectra of distant galaxies and quasars arising from the Lyman-alpha electron transition of the neutral hydrogen atom.

Excerpt from the Wikipedia article “Lyman-alpha forest”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Yuan-Sen Ting https://twitter.com/TingAstro/status/1429990957596909588, CC BY-SA 4.0, via Wikimedia Commons.