nuclear fusion
US /ˌnuː.klɪər ˈfjuː.ʒən/
UK /ˌnuː.klɪər ˈfjuː.ʒən/

1.
Kernfusion
a nuclear reaction in which atomic nuclei of low atomic number fuse to form a heavier nucleus with the release of energy.
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Scientists are working to harness nuclear fusion as a clean energy source.
Wissenschaftler arbeiten daran, Kernfusion als saubere Energiequelle zu nutzen.
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The sun's energy is produced through nuclear fusion.
Die Energie der Sonne wird durch Kernfusion erzeugt.