4. Main Sequence
The main sequence phase is the stage in development where the core temperature reaches the point for the fusion to commence. In this process, the protons of hydrogen are converted into atoms of helium. This reaction is exothermic; it gives off more heat than it requires and so the core of a main-sequence star releases a tremendous amount of energy
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This Idea helps to know how a star evolves and through what process it goes to become a star like "The sun" and ultimately end up to star remnants.
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