Slide 32: In the sun, it is believed that the following reaction takes place: (1) When hydrogen atoms fuse, one of the protons is converted into a neutron and positron resulting in the formation of deuterium. (2) Deuterium and another hydrogen fuse to form the lightest isotope of helium-2He3, releasing gamma radiation. (3) Two light isotopes of helium 2He3 combine, forming 2He4, the common form of helium and two free protons (hydrogen).
