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.

Question

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.

Quizplus · Accepted Answer

The Answer of 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.

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