Now that we know the basic properties of stars, we look at how the laws of physics determine those properties, and then how stars change with time - how they evolve. Stars go through a recurring full life cycle.They are born, they live through middle age, and they die. In their death, they distribute material into interstellar space to be incorporated into the next generation of stars.
In describing the life cycle, we can start anywhere in the process. In Chapter 9, we discuss the most stable part of their life cycle, life on the main sequence - stellar middle age. In Chapters 10, 11 and 12 we will look at the deaths of different types of stars.After discussing the interstellar medium in Chapter 14, we will look at star formation in Chapter 15.
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