Q: What is fusion and how can it produce energy?
A: Fusion is the energy source of our sun and the stars. In a fusion reaction, two atomic nuclei fuse and produce very fast-moving particles. Billions of such reactions occurring in a hot gas of electrically-charged particles, a plasma, produce substantial heat. So a reactor produces heat from fusion using hot plasma. The heat then can be converted to electricity. Essentially, we would be producing a “star on earth,” taking its energy, converting it to steam and generating electricity.