The sun produces energy and helium from hydrogen by nuclear fusion. The picture shows the proton-proton-cycle astronomy astrophysics beta Pp-cycle
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A schematic of the classic Grove gas battery. A series of fuel cells consuming hydrogen and oxygen are used to produce hydrogen and oxygen in a single electrolyzer. electrolyzer hydrogen fuel cell Grove Gas Battery
Stars produce energy and helium by nuclear fusion of hydrogen running the carbon-nitrogen-oxygen process. energy neutrino decay Cno