The energy that process releases is actually what keeps the star’s gravity from collapsing it entirely. As the hydrogen is used up, the core of the star condenses and heats up even more. Our Sun has provided an essentially constant amount of heat and light to Earth for about 4.5 billion years. When the star dies after millions or billions of years, it may release heavier elements such as gold. It is the opposite reaction of fission, where heavy isotopes are split apart. Hydrogen is the fuel for the process. When the core is hot enough, nuclear fusion commences. Nuclear Reactions in Stars The energy of the stars comes from nuclear fusion processes. Hydrogen fusion is the fundamental nuclear reaction in stars. This promotes the fusion of heavier and heavier elements, ultimately forming all the elements up to iron. Fusion is the process where two hydrogen atoms combine to form a helium atom, releasing energy. The two most prominent reactions that fuse hydrogen into helium are: PP Chain and CNO Cycle. Silicon Fusion: Silicon fusion in stars is the last stage of fusion. Stars created everything else, including most of the atoms in your body. 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. Hydrogen Fusion. The fourth possible fusion process creates sulfur-31 plus a neutron, and it releases 1.459 MeV. For stars like the sun which have internal temperatures less than fifteen million Kelvin, the dominant fusion process is proton-proton fusion.For more massive stars which can achieve higher temperatures, the carbon cycle fusion becomes the dominant mechanism. The fusion of hydrogen nuclei uses up hydrogen to produce helium and energy. Fusion inside stars transforms hydrogen into helium, heat, and radiation. This process is called nuclear fusion. A star lives while there’s balance between the outward push of energy from nuclear fusion and the inward press of gravity. 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. The Details. Every second, a star like our Sun converts 4 million tons of its material into heat and light through the process of nuclear fusion. A fifth possible end-product is sulfur-32 plus a photon, and this releases the most energy of the different oxygen fusion processes, 16.539 MeV. is the process by which two or more atomic nuclei join together, or "fuse", to form a single heavier nucleus Fusion is the process that powers active stars, the hydrogen bomb and experimental devices examining fusion power for electrical generation. It is also called "hydrogen burning", which should not be confused with the chemical combustion of hydrogen in an oxidizing atmosphere. The fusion process forces hydrogen atoms together, transforming them into heavier elements such as helium, carbon and oxygen. Nuclear Fusion It is a nuclear process, where energy is produced by smashing together light atoms. Fusion is the process by which the sun and other stars generate light and heat. In the article of Hertzsprung Russell Diagram, we learnt that any star that is fusing hydrogen in its core is known as a main sequence star.Our Sun is a main sequence star. All of the atoms in the universe began as hydrogen. 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. When the new star reaches a certain size, a process called nuclear fusion ignites, generating the star's vast energy. The energy released from the collapse of the gas into a protostar causes the center of the protostar to become extremely hot. 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