An Etymological Dictionary of Astronomy and Astrophysics

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فرهنگ ریشه‌شناختی اخترشناسی-اخترفیزیک

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Lyman alpha forest
  جنگل ِ لایمن-‌آلفا  
jangal-e Lyman-alpha (#)
Fr.: forêt Lyman alpha  

The appearance of many differentially → redshifted→ Lyman alpha lines in → absorption in a → quasar’s → spectrum, caused by intervening → hydrogen clouds along our → line of sight to the quasar.

See also: → Lyman; → forest.