What defines a star's time on the main sequence phase?
Answer
Fusing hydrogen atoms into helium atoms in its core
The main sequence phase constitutes the vast majority of a star's existence, marked by a stable equilibrium where the outward pressure generated by thermonuclear fusion in the core precisely counteracts the inward force of gravity. During this prolonged period, the dominant fusion process involves converting hydrogen nuclei into helium nuclei within the stellar core. This specific nuclear reaction dictates the star's long, stable lifespan until the core hydrogen fuel is exhausted, at which point the star begins its transition into later evolutionary stages.
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