The sun generates its energy through nuclear fusion, making helium from hydrogen. The main process by which this happens, called the proton-proton chain goes as follows: . Two protons come together to create deuterium, a positron, a neutrino, and energy: p+ p - D + e + v + energy . The deuterium fuses with another proton to make He: D + p - He + energy . Fianlly, "He is produced by fusing two He nuclei together. He . He - He + p +p + energy