Problem: Spectral lines are of particular importance in astronomy becauseA. only stars can produce bright spectral lines.B. they are the only light bright enough to be seen at large distances.C. they often tell us about the ingredients of the source producing the light.

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Spectral line: A line in a spectrum caused by emission or absorption of light at a discrete frequency. 

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Problem Details

Spectral lines are of particular importance in astronomy because

A. only stars can produce bright spectral lines.

B. they are the only light bright enough to be seen at large distances.

C. they often tell us about the ingredients of the source producing the light.

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