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Nuclear fusion is a physical process in which two or more light atomic nuclei combine to form a single, heavier nucleus, releasing immense amounts of energy. It requires extreme heat and pressure to overcome the eletrical repulsion between the two nuclei. The most well-documented approach for Earth-based power uses Deuterium (2H) and Tritium (3H).
Nuclear fusion is the process that powers stars and is also responsible for the energy release in the second stage of thermonuclear weapons.