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Almost everything we know today about the stars and their life cycle is a direct result of the correct interpretation of our main source of evidence on the stars (their spectra) by a graduate student of very Young appointed Cecilia Payne.

Before its discovery in 1925 astronomers thought all the stars were made on exactly the same elements as the earth, in the same proportions as their spectra appear to show that(spectra also show that, of course).

Now, with Cecilia, we know that the differences are due simply to different amounts of ionization of hydrogen and NOT to the various elements.

Since the hydrogen atom is the only simple enough to do what we do out in the way they do it all started to fall in place and we jumped light years ahead in our understanding

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