Nuclear fusion is a type of nuclear reactions in which small atomic nuclei join to form one or more atomic nuclei and subatomic particles releasing a lot of energy.
The core of the sun is the center of the sun. This is where nuclear fusion occurs generating energy by converting hydrogen to helium.
In the core of the sun which is the innermost layer of the sun there are very high temperatures and pressures which trigger nuclear fusion. Hydrogen atoms fuse to form helium atoms, a reaction which gives off tremendous amount of heat and light.
