Main Sequence Phase
Main Sequence Phase is the longest stage in the life cycle of a star, during which it fuses hydrogen atoms into helium in its core. This process releases energy that counteracts the gravitational force pulling the star inward, resulting in a stable equilibrium. The duration of this phase depends on the mass of the star, with more massive stars having shorter main sequence lifetimes. During this phase, the star's luminosity, temperature, and radius remain relatively constant. However, as the star exhausts its hydrogen fuel, it will eventually evolve into a red giant or supergiant, marking the end of the main sequence phase.
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