Nuclear energy can also be released by fusion of two light elements (elements with low atomic numbers). In a hydrogen bomb, two isotopes of hydrogen, deuterium and tritium are fused to form a nucleus of helium and a neutron. Nuclear fusion is the process of making a single heavy nucleus (part of an atom) from two lighter nuclei.This process is called a nuclear reaction.It releases a large amount of energy.. The power that fuels the sun and the stars is nuclear fusion. The use of nuclear fusion reactions for electricity generation remains theoretical. Nuclear Fusion. Nuclear fusion, which generates energy by fusing atoms together (similar to how the Sun works), is recognized as a safe and affordable way to access potentially limitless energy. Fusion Milestone. Nuclear fuel—uranium . The researchers claimed that heat – which could only be explained in terms of nuclear processes – was produced, as well as fusion byproducts, including helium, tritium and neutrons. The nucleus made by fusion is heavier than either of the starting nuclei. On the sun, in a series of nuclear reactions, four isotopes of hydrogen-1 are fused into […] The most important reaction within the core of the Sun is the process called the "proton-proton cycle." The fusion process is the reaction that powers the sun. With its high energy yields, low nuclear waste production, and lack of air pollution, fusion, the same source that powers stars, could provide an alternative to conventional energy sources. Since the 1930s, scientists have known that the Sun and other stars generate their energy by nuclear fusion. In fission, a heavy nucleus is split into smaller nuclei. A colorful primer on the power source that could change everything. With fusion, lighter nuclei are fused into a heavier nucleus. It is the type of reaction that powers a hydrogen bomb. Fusion, in contrast, occurs when two or more smaller atoms fuse together, creating a larger, heavier atom. Uranium is considered a nonrenewable energy source, even though it is a common metal found in rocks worldwide. This fusion releases 17.6 MeV of energy. Nuclear fusion is essentially the opposite of nuclear fission. Nuclear power plants use a certain kind of uranium, referred to as U-235, for fuel because its atoms are easily split apart. By Eric Limer. Fusion reactor, also called fusion power plant or thermonuclear reactor, a device to produce electrical power from the energy released in a nuclear fusion reaction. Everything You Should Know About Nuclear Fusion, Explained in Six Minutes. Nuclear fusion and nuclear fission are different types of reactions that release energy due to the presence of high-powered atomic bonds between particles found within a nucleus. In fission, an atom is split into two or more smaller, lighter atoms. 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