THE fact that the so-called nebulium lines are found to be associated with hydrogen and helium lines only ... in all places of which there appear spectral lines of unknown origin or under ...
In 1925, grad student Cecilia Payne first proposed that stars were mostly made of hydrogen and helium and shaped our ...
Astronomy on MSN5mon
How does spectroscopy work?How do scientists know what spectral lines belong to which compound ... have to separate the signature of hydrogen from the ...
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