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abstraction > mathematical concept > number > quantity > radiation measurement > spectral feature > spectral line > hydrogen line > Lyman line > Lyman alpha
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Lyman alpha comparison table
Subject has lower energy level has specie has upper energy level has definition has series limit is a kind of has wavelength is an instance of
Lyman line1hydrogen (H I)  912 Åhydrogen line  
resonance line   The longest-wavelength line arising from the ground state. spectral line  
Lyman alpha1hydrogen (H I)2The resonance line of hydrogen. It can only be studied from spacecraft or in the spectra of highly redshifted quasars.912 Å 1215.67 ÅLyman line

Next Lyman lineLyman beta    UpLyman line, resonance line