Now that we have the tiny world of elementary particles in hand, we return to the big universe. At this point, we will examine the most common cosmic objects, stars. Our Sun is a typical star, and we have learned many facts about stars by studying the Sun. But there are many different kinds of stars, some very different from the Sun. In fact, those very differences have helped us to understand the structure of the stars and the physics determining their life cycle. We begin with the spectra of their light.
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