I has to do with something called the Binding Energy Per Nucleon. If you march up the curve from small numbers to get energy you are fusion. If you march down t

I has to do with something called the Binding Energy Per Nucleon. If you march up the curve from small numbers to get energy you are fusion. If you march down the curve from high numbers, you are fission. If you march up the curve from small numbers and go all the way to large numbers even though that's endothermic, you are a supernova. https://en.wikipedia.org/wiki/Nuclear_binding_energy#Nuclear_binding_energy_curve https://en.wikipedia.org/wiki/Nuclear_binding_energy#Nuclear...