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Yes, fusion is exothermic until nickel & iron are produced.
The process is called stellar nucleosynthesis and is based on nuclear fusion reactions.
iron
the fusion of 4 hydrogen atoms to form 1 helium atom. Fusion of light atoms results in new energy, just as the breaking apart (fission) of heavy atoms does. It happens that iron is the mid-point (i.e. the atom with the least binding energy).
They use nuclear fusion and the iron makes light escape.
In general, nuclear fusion produces a new atom (or, in some cases, two atoms), a change in the amount of heat present and possibly some other emission. The specific products of nuclear fusion depend on what is being fused. The fusion of 2H + 2H produces 3H + a proton + 4.02 MeV The fusion of 2H + 3H produces 4He + a neutron + 17.6 MeV The fusion of 6Li + 2H can produce 4He + 4He + 22.4 MeV In the cases where fusion produces atoms heavier than iron, the reaction is endothermic, consuming heat rather than producing it.
In general, nuclear fusion produces a new atom (or, in some cases, two atoms), a change in the amount of heat present and possibly some other emission. The specific products of nuclear fusion depend on what is being fused. The fusion of 2H + 2H produces 3H + a proton + 4.02 MeV The fusion of 2H + 3H produces 4He + a neutron + 17.6 MeV The fusion of 6Li + 2H can produce 4He + 4He + 22.4 MeV In the cases where fusion produces atoms heavier than iron, the reaction is endothermic, consuming heat rather than producing it.
Nuclear Fusion only releases energy when elements that are higher than what Nuclear Fusion produces certain sotopes of lighter elements.
nuclear fusion would not occur
Nuclear fusion: mainly of hydrogen into helium. To a lesser extent there is fusion of helium into larger elements - all the way to iron.
Nuclear fusion, which is the mechanism by which stars operate, will cause lighter nuclei to "combine" (fuse) to create heavier ones. It will also cause a lot of energy to appear. This is because the fusion reactions are exothermic (at least through fusion that creates elements up through iron).
They are similar only in that they are nuclear reactions. In nuclear fission involves the splitting of an atomic nucleus, whereas nuclear fusion involves the joining together of atomic nuclei.