Nuclear fusion is the opposite of fission, in that it involves the fusing of two or more atoms together to form a new, heavier element. The newly formed atom will contain slightly less mass than the sum of the atoms that were used to create it. The missing mass is converted into energy. The energy output of fusion is several times greater than that achieved in the fission process. While fusion does produce some radioactive by-products, they are extremely short-lived in comparison to fission.

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