The Sun is composed of mostly hydrogen, helium and small traces to metals. The Sun shine from the energy created from the conversion of hydrogen to helium through nuclear fusion.
All stars are pretty much giant exploding balls of gas. The gases they are made up of hydrogen and helium, with varying amounts of other gases. The amounts of the other gases depends on the age of the star. The gases mimic a nuclear reaction and stars are constantly exploding, but because they are so large and have so much matter it takes them billions of years for the explosion to use all the gaseous matter that contributes to the reaction.
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