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Nuclear Fission and Nuclear Fusion are the reactions which enable stars to give off heat and light.

Nuclear Fission: When a nucleus of an atom of heavy element splits is called nuclear fission. The principle used in Nuclear reactors. Uranium 255 is broken down to form krypton and lead.

Nuclear Fusion: When nuclei of 2 or more light atoms fuse or join together is called nuclear fusion. The principle used in Hydrogen Bomb. Two Hydrogen atoms fuse together to form a Helium atom.

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14y ago

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