why do stars evolve?
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Nuclear fusion powers a star for most of its life. Initially the energy is generated by the fusion of hydrogen atoms at the core of the main-sequence star. Later, as the preponderance of atoms at the core becomes helium, stars like the Sun begin to fuse hydrogen along a spherical shell surrounding the core.
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Why do stars change in their outward properties (L, Ts, R), as they mature as a main sequence stars and then age toward their demise as giant and supergiant stars?
The short answer is that because changes (whether gradual shrinking or contraction) in a star's core where fusion is occuring (or perhaps no longer occuring!) must result in changes throughout the rest of the star, including its surface.
The short answer is that because changes (whether gradual shrinking or contraction) in a star's core where fusion is occuring (or perhaps no longer occuring!) must result in changes throughout the rest of the star, including its surface.
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