Fission is used nowadays since it is technological and economically feasible
Fussion is very disscussed due to the high energy, high density requiremenets. Also it is dangerous. It is used in bombs but not in energy production.
Fussion = joining atoms/molecules (releases energy)
Fission = splitting atoms/molecules (releases energy)
Normally, fission does not occur in nature whereas fission occurs in the sun or stars
For fission, we require little energy for starting the process, for fussion, we require very high T which is dangerous
The fuel for fission is normally uranium
the fuel for fussion is normally Hydrogen isotopes
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