Final answer:
Spectroscopy in astronomy provides critical information about the composition, temperature, and other characteristics of celestial objects.
Explanation:
Spectroscopy is a powerful tool in astronomy that provides information about the composition, temperature, and other characteristics of celestial objects. It allows astronomers to decode the messages carried by photons to understand the objects in space better. For example, by analyzing the spectrum of a star, astronomers can determine its chemical composition, temperature, and motion.
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