KnowraLyman-alpha forestLinked fromLinked fromThe 12 pages that link to Lyman-alpha forest, each with the reason it gives.All 12Broader topic 3Related 6Compared with 3Spectral lineBroader topic: Each feature records hydrogen absorption at a different intervening cosmic redshift.Hydrogen spectral seriesBroader topic: Lyman-series absorption reveals hydrogen gas between distant sources and Earth.Lyman seriesBroader topic: Redshifted Lyman-alpha absorption maps hydrogen gas along distant sightlines.