Do colored lines correspond to dark lines for the same gas?
Astronomers can decode the properties of various objects in space by scanning their "rainbow barcode," or spectra. 
Materials emit and interact with specific wavelengths of light in unique ways. Each type of spectra has particular uses: https://bit.ly/3hzSc71 pic.twitter.com/IaPrtn04BS
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The answer is YES as could be read in the interesting link in the tweet.
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Can it be used to find something that is not yet listed in the periodic table??
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It could, if there were naturally-occurring elements left to find. Helium was discovered that way. But uranium was the heaviest natural element still out there. All those since are artificial.
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