Answer :
Nuclear fusion has always warmed the Earth since it is the source of energy for the Sun, which warms it. Radioactive decay has always warmed the Earth from the inside out through the energy of gamma radiation.
A reaction known as nuclear fusion occurs when two or more atomic nuclei fuse to create new atomic and subatomic particles (neutrons or protons). Energy is released or absorbed depending on how much mass there is between the reactants and products. The difference in nuclear binding energy between the atomic nuclei before and after the reaction is what causes this mass difference. Large amounts of energy are generated during nuclear fusion, which fuels active stars, main sequence stars, and other high-magnitude stars. Energy is often released during nuclear fusion processes that result in atomic nuclei lighter than iron-56 or nickel-62. These substances have a comparatively low mass and a high nucleon binding energy. When lighter nuclei fuse, energy is released (an exothermic process), however when heavier nuclei fuse, the resultant nucleons retain energy and the reaction is endothermic. Nuclear fission, the opposing process, operates in the exact opposite way. While heavier atoms like uranium, thorium, and plutonium are more fissionable, nuclear fusion uses lighter elements like hydrogen and helium, which are often more fusible. A supernova, an extremely powerful astronomical event, has the power to combine materials heavier than iron.
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