Nuclear fusion is a mechanism by which two atomic nuclei are brought together to yield energy. Nuclear fusion powers stars by proton-proton fusion and the CNO cycle. A simplified version of the proton-proton fusion reaction is: 4p +2e He + 2ve + Efusion (1) where p represents a proton, e is an electron, Ve is an electron neutrino and Efusion is the net energy that is produced. Question 1 [5 points]: Explain why reaction 1 produces net energy (Efusion).