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Stellar evolution is the process by which a star changes over the course of time. It encompasses the formation, life cycle, and eventual fate of stars.
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Main Sequence Star: A stage in stellar evolution where a star fuses hydrogen into helium in its core.
Red Giant: A late phase in stellar evolution where a star expands and cools after exhausting hydrogen in its core.
Supernova: A powerful explosion that occurs when a massive star exhausts its nuclear fuel and collapses under gravity.