The process that is responsible for the generation of energy within the core of the sun is:
Nuclear fission
Nuclear fusion
Atomic collision
Atomic excitation
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UPSC Geoscientist – 2021
Nuclear fusion is a process where light atomic nuclei combine to form a heavier nucleus, releasing a large amount of energy. In the Sun, this process is primarily the proton-proton chain, where four hydrogen nuclei (protons) ultimately fuse to form one helium nucleus.