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Compared with a star having many blue absorption lines, a star with many red and blue absorption lines must be cooler than the other star. moving away from the other star. moving away from the observer.
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Compared with a star having many blue absorption lines, a star with many red and blue absorption lines must be

cooler than the other star.
moving away from the other star.
moving away from the observer.
of different composition than that of the other star.

User KoemsieLy
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1 Answer

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of different composition than that of the other star.
User Zen Hacker
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