When fusion happens in a star from the helium isotopes it has bi products helium which is only done during the first lot of fusion reactions
Helium is formed in stars through nuclear fusion, where hydrogen nuclei combine under high temperatures and pressures. Initially, hydrogen fuses to create deuterium, which further reacts to form helium-3 and eventually helium-4. This process releases substantial energy, powering the star's luminosity and leading to the formation of heavier elements later on.
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