What primarily triggers the transition of a Main Sequence star into a red giant?
Answer
The exhaustion of hydrogen fuel in the core
The life cycle of a star is fundamentally tied to its available hydrogen supply. Once the hydrogen in the core is depleted, the fusion process that generates the outward radiation pressure ceases. Without this pressure to counteract the weight of the star's outer layers, the core begins to contract. This contraction signifies the end of the Main Sequence phase and initiates the structural reconfiguration that leads to the bloated state of a red giant.
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