Nuclear fusion is the joining of small atomic nuclei.
Two light nuclei like hydrogen, can join to create a large nucleus. This is called nuclear fusion.
Fusion releases a lot of energy (even more than nuclear fission).
Fusion doesn't leave behind a lot of radioactive waste and there's plently of hydrgoen around to use as fuel.
Fusion can only happen at high temperatures - about 10,000,000 degreese celsius.
You need an extremely stong magnetic field for fusion as you can't hold the hydrogen at high temperatures.
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