Which Of The Following Could Not Be Determined By An Observation That Uses Only Spectroscopy?

(Correct Answer Below)

Which Of The Following Could Not Be Determined By An Observation That Uses Only Spectroscopy?

A) the chemical composition of a distant star B) the speed at which a distant galaxy is moving away from us C) the surface temperature of a distant star D) the rotation rate of a distant star E) the size of a distant galaxy
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E) the size of a distant galaxy

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