Final answer:
Nuclear fusion played a crucial role in the Big Bang, leading to the formation of hydrogen and helium, the expansion of the universe, and the generation of photons.
Step-by-step explanation:
Nuclear fusion plays a significant role in the Big Bang. One of the key aspects is that hydrogen and helium, the two most abundant elements in the universe, were formed through nuclear fusion in the early stages of the Big Bang. The fusion of protons and neutrons during this process generated the first atomic nuclei. Additionally, photons, which are particles of light, were also generated by early fusion reactions. The energy released through fusion reactions allowed the universe to expand and evolve.
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