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Fusion in the sun converts Hydrogen into Helium, so finding out how much Helium is in the Sun can determine how old it is.

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What can be said about the star composition if the spectrum of a star shows the same absorption lines as the sun?

If the spectrum of a star shows the same absorption lines as the sun than you know that the star has the same composition as the sun. This means that the star is made of the same elements as the sun.


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