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lect 10 - The Birth of Stars Chapter 18 Understanding how...

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The Birth of Stars Chapter 18
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Understanding how stars evolve requires observation and ideas from physics Because stars shine by thermonuclear reactions, they have a finite life span – That is, they fuse lighter elements into heavier elements – When the lighter elements are depleted, there is nothing left to fuse The theory of stellar evolution (not in the same sense as biological evolution, but more like life cycle development, like growing up) describes how stars form and change during that life span
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