Final answer:
Main sequence stars fuse hydrogen to form helium. Large stars burn through hydrogen quickly, while small stars have longer main sequence lives.
Explanation:
Main Sequence Stars:
Stars on the main sequence, like our Sun, primarily fuse hydrogen to form helium. Large stars burn through hydrogen rapidly and have short lives, while tiny stars can remain on the main sequence for billions of years. This phase is crucial for a star's energy production and equilibrium.
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