Hello, I was having a difficult time understanding some instances of nucleosynthesis. Two hydrogens (each with just 1 proton) come together to form deuterium (1 proton and 1 neutron).... but why does this happen as opposed to forming a di-proton (2 protons). I've been told that it has something to do with the strength of strong nuclear force. That if the force were stronger than it would be a di-proton as opposed to deuterium.... but then the rate of stars burning would be too rapid. Does one of the protons convert to a neutron while forming deuterium as opposed to a di-proton? Thanks for any help.