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nuclear fission and nuclear fusion
Fusion and fission nuclear reactions.
Nuclear fusion
You probably mean nuclear fusion
Fission and fusion are different nuclear reactions.
Nuclear fusion is a nuclear reaction, but so is fission. So not all nuclear reactions are fission.
There are four types of nuclear reactions. Fusion Fission Radioactive Decay Artificial Transmutation
Nuclear energy is obtained through fission and fusion reactions.
The stars produce their heat from nuclear fusion reactions. Work on earth to produce controllable nuclear fusion is concentrating on one particular reaction, between deuterium and tritium, because it is the easiest to get going (though hard enough!). Stars operate with other reactions but all of the nuclear fusion type. You can read more in Wikipedia 'Nuclear fusion'
What is a finalproduct of nuclear fusion in the sun
The sun's nuclear reactions are fusion reactions at extremely high temperatures and pressures, while the nuclear reactor's nuclear reactions are fission reactions at typical temperatures and pressures for earth.
Uncontrolled nuclear fusion reactions.