Nuclear Fusion. 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. The power that fuels the sun and the stars is nuclear fusion. Fusion, in contrast, occurs when two or more smaller atoms fuse together, creating a larger, heavier atom. The most important reaction within the core of the Sun is the process called the "proton-proton cycle." Nuclear energy can also be released by fusion of two light elements (elements with low atomic numbers). 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. By Eric Limer. 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. Uranium is the fuel most widely used by nuclear plants for nuclear fission. 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.. With fusion, lighter nuclei are fused into a heavier nucleus. 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. Fusion Milestone. Since the 1930s, scientists have known that the Sun and other stars generate their energy by nuclear fusion. Nuclear fusion can pro­vide a safe, clean energy source for future generations with several advantages over current fission reactors: Abundant fuel supply - Deuterium can be readily extracted from seawater, and excess tritium can be made in the fusion reactor itself … The fusion process is the reaction that powers the sun. On the sun, in a series of nuclear reactions, four isotopes of hydrogen-1 are fused into […] In a hydrogen bomb, two isotopes of hydrogen, deuterium and tritium are fused to form a nucleus of helium and a neutron. In fission, a heavy nucleus is split into smaller nuclei. Nuclear fuel—uranium . Other experimenters failed to replicate this, however, and most of the scientific community no longer considers it a … Nuclear fusion is essentially the opposite of nuclear fission. A colorful primer on the power source that could change everything. In fission, an atom is split into two or more smaller, lighter atoms. Uranium is considered a nonrenewable energy source, even though it is a common metal found in rocks worldwide. In the core, pressures and temperatures are high enough to force fusion, that is, nuclear reactions whereby some nuclei merge to make others. Nuclear power plants use a certain kind of uranium, referred to as U-235, for fuel because its atoms are easily split apart. 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