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During the First Year of Its Operation, Only 20% of the Projects

Question 3

Essay

During the first year of its operation, only 20% of the projects scheduled for the Hubble Space Telescope involved taking images and pictures of celestial objects. The remaining 80% of the telescope's time was devoted to observing the spectrum of celestial objects.
Why do astronomers place such a high emphasis on looking at the spectrum of a celestial object rather than an image? Explain.

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