An Etymological Dictionary of Astronomy and Astrophysics

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فرهنگ ریشه‌شناختی اخترشناسی-اخترفیزیک

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hydrogen line
  خط ِ هیدروژن  
xatt-e hidrožen (#)
Fr.: raie de l'hydrogène  

An → emission or → absorption line in the spectra of various astronomical objects produced by the presence of hydrogen atoms in particular physical conditions.

See also: → hydrogen, → line.