Because it is there.
Nuclear fusion is used only in experimental installations.
Because you can blow people with the nuclear powers
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Hydrogen bombs use the same process of nuclear fusionthat powers the Sun.
nuclear fusion
The strong nuclear force.
Fusion.
Stars are powered by nuclear fusion
nuclear energy is perfectly natural, what do you think powers the sun: nuclear fusion.
Nuclear explosions are the result of splitting the atom. It is actually what powers the sun.
Nuclear energy is used to boil water in order to produce steam. The steam is used to drive a turbine that can either be mechanically hooked up, i.e. the propeller on a nuclear submarine, or the turbine can be linked to a generator which then powers an electric motor.
The nuclear energy that is most important for life on Earth is the nuclear fusion that powers the sun. This energy is essential for providing heat and light, which support life on our planet. Nuclear fission, used in nuclear power plants, also plays a role in providing electricity for human activities.