Explain why the presence of spectral lines of a given element in the solar spectrum tells us that element is present in the sun, but the absence of the lines would not mean the element was absent from the sun?

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The Answer of Explain why the presence of spectral lines of a given element in the solar spectrum tells us that element is present in the sun, but the absence of the lines would not mean the element was absent from the sun?

Explain Why the Presence of Spectral Lines of a Given