What determines what happens to as main sequence star as it spends time in the main sequence and what happens after it leaves the main sequence?.

They are all undergoing the fusion of hydrogen into helium within their cores.Main sequence stars are characterized by the source of their energy. They are all experiencing a combination of hydrogen into helium inside their cores. The rate at which they do this and the sum of fuel accessible depend upon the mass of the star. Mass is the major factor in deciding the life expectancy of a main sequence star, its estimate, and its glow. Stars on the main sequence moreover show up to be constant for long periods of time. Any demonstration of such stars must be able to account for their stability. The main sequence is the organization where a star spends most of its presence. Relative to other stages in a star's life, which is extremely long. Nucleosynthesis basically alludes to the generation of nuclei heavier than hydrogen. This happens in main sequence stars through two fundamental forms, the proton-proton chain and the CNO cycle which is carbon, nitrogen, and oxygen. Primordial nucleosynthesis occurred exceptionally early in the history of the Universe, coming about in a few heliums and little follow of lithium and deuterium, the overwhelming isotope of hydrogen.To know more about the main sequence star refer to  the  link https://brainly.com/question/12290664?referrer=searchResults.#SPJ4