Fusion energy is energy obtained from fusion reactions. Fusion reactions are a type of nuclear reactions. However, the most common type of nuclear reaction used for power on earth is nuclear fission, which splits heavy atoms apart, releasing energy. Fusion reactions, however, combine light atoms to make heavier ones, also releasing energy at the same time. The sun, and many other stars, also release use nuclear fusion to produce the immense amount of energy in the light they emit.
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