How do scientists use a spectroscope to determine a star's composition? A. They study patterns in light bands that are separated from starlight by the spectroscope. B. They use the spectroscope to study sound waves that are traveling from the star. C. They use the spectroscope to create a man-made star that they study in a lab. D. They run tests on gas samples that the spectroscope collects from the star's core.
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