Off the Beaten Track

While some 90 percent of stars fall into the region plotted as the main sequence, about 10 percent lie outside this range. These include white dwarfs, which are far less luminous than we might expect from their high surface temperatures, and red giants, which are far more luminous than we would expect from their relatively low surface temperatures. In Chapter 18, "Stellar Careers," we'll describe how stars leave the main sequence and end up here. Briefly, these are stars that have used up their fuel, and are in the process of dying.

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Telescopes Mastery

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