is the process by which two or more atomic nuclei join together, or "fuse", to form a single heavier nucleus. Main sequence stars are stars that are fusing hydrogen atoms to form helium atoms in their cores. Nucleon. The star eventually will cool down and die. Most of the stars in the universe are main sequence stars. The star uses a process called nuclear fusion to generate energy. Nuclear fusion Jump to: navigation, search This article is about the science behind nuclear fusion.For its use in producing energy, see fusion power.. Nuclear Fusion: Nuclear fusion is the process by which nuclear reactions between light elements form heavier ones (up to iron). Fusion inside stars transforms hydrogen into helium, heat, and radiation. Stellar nucleosynthesis is the process by which elements are created within stars by combining the protons and neutrons together from the nuclei of lighter elements. Hydrogen is the fuel for the process. Nucleosynthesis definition, the formation of new atomic nuclei by nuclear reactions, thought to occur in the interiors of stars and in the early stages of development of the universe. Nuclear fusion is a process that combines nuclei in order to release energy. The fusion of hydrogen nuclei uses up hydrogen to produce helium and energy. In cases where the interacting nuclei belong to elements with low atomic numbers (e.g., hydrogen [atomic number 1] or its isotopes deuterium and tritium), substantial amounts of energy are released. Nuclear fusion is an atomic reaction that fuels stars. The sun is a main sequence star. In fusion, many nuclei (the centers of atoms ) combine together to make a larger one (which is a different element). On Earth it is very difficult to start nuclear fusion reactions that release more energy than is needed to start the reaction. As the hydrogen is used up, the core of the star condenses and heats up even more. See more. All of the atoms in the universe began as hydrogen. This promotes the fusion of heavier and heavier elements, ultimately forming all the elements up to iron. Nuclear fusion, process by which nuclear reactions between light elements form heavier elements (up to iron). Nuclear fusion. Fusion. Hydrogen fusion (nuclear fusion of four protons to form a helium-4 nucleus) is the dominant process that generates energy in the cores of main-sequence stars. It is also called "hydrogen burning", which should not be confused with the chemical combustion of hydrogen in an oxidizing atmosphere. a collective name for two particles: the neutron and the proton. is the process that powers active stars, the hydrogen bomb and experimental devices examining fusion power for electrical generation. Nuclear fusion definition is - a process in which the nuclei of atoms are joined. In their cores that combines nuclei in order to release energy helium atoms in the universe are sequence! 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