Stars evolve primarily because they run out of fuel in their cores.

Name: Stars evolve primarily because they run out of fuel in their cores.
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As a star burns through its hydrogen fuel, the core contracts and heats up, allowing helium to fuse into heavier elements. Eventually, this process will cease and the core will no longer produce energy. This causes the outer layers of the star to expand and cool, leading to various stages of stellar evolution.

Stars Evolve Primarily Because They Run Out of Fuel in Their