= Lyman-alpha forest
{wiki=Lyman-alpha_forest}
The Lyman-alpha forest refers to a series of absorption lines in the spectra of distant quasars, primarily produced by intervening clouds of hydrogen gas in the intergalactic medium. When light from a quasar passes through these clouds, certain wavelengths of that light are absorbed due to the Lyman-alpha transition of hydrogen, which corresponds to a specific wavelength of 121.6 nanometers in the ultraviolet region of the spectrum.
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