![Diagram of a proton–proton chain reaction.](http://static.sciencelearn.org.nz/images/images/000/000/244/full/Proton-proton-chain-reaction20150924-22473-1a5pn6c.jpg?1674163957)
A proton–proton chain reaction is one of the ways by which stars fuse hydrogen into helium. It is the reaction that dominates in stars the size of the Sun.
A proton–proton chain reaction is one of the ways by which stars fuse hydrogen into helium. It is the reaction that dominates in stars the size of the Sun.