Answer :
Within their cores, they are all undergoing the fusion of hydrogen into helium.
- The source of their energy is a characteristic of main sequence stars. Inside their cores, they are all conducting a hydrogen to helium conversion. The mass of the star affects how quickly they accomplish this and how much fuel is available. The key determinant of a main sequence star's life expectancy, estimation, and glow is its mass. Additionally, stars in the main sequence appear to be consistent for extended periods of time. Any proof of such stars needs to be able to explain their stability.
- A star typically spends the most of their time in the main sequence. In essence, nucleosynthesis refers to the production of nuclei heavier than hydrogen. The proton-proton chain and the CNO cycle, which consists of carbon, nitrogen, and oxygen, are two fundamental modes via which this occurs in main sequence stars. Primordial nucleosynthesis, which produced the dominant hydrogen isotope, deuterium, and a few helium, took place extremely early in the history of the universe.
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