Stars evolve over their lifetime based on their initial mass and composition. Lower mass stars like our Sun spend most of their lifetime stably fusing hydrogen into helium in their cores before expanding into red giants and fusing heavier elements. Higher mass stars have shorter lifetimes as they rapidly fuse heavier elements, eventually ending their lives in dramatic supernova explosions that seed the galaxy with heavier elements essential for life.

1. Stellar Structure & Evolution: Part 7
Evolution of stars
K. Yugindro Singh
Manipur University

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