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When we measure the broadening of absorption lines in the spectrum of an elliptical galaxy, we can infer.

When we measure the broadening of absorption lines in the spectrum of an elliptical galaxy, we can infer.
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When we measure the broadening of absorption lines in the spectrum of an elliptical galaxy, we can infer.

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User Randnum
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Answer: the galaxy's rotation curve

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User Peol
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