what is sun made up of ?
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The Sun isn't "made of fire". It's made mostly of hydrogen and helium. Its heat and light come from nuclear fusion, a very different process that doesn't require oxygen. Ordinary fire is a chemical reaction; fusion merges hydrogen nuclei into helium, and produces much more energy.
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Sun is a star made up of hot gases. Most of it is hydrogen (72%) which undergoes fusion reactions to release energy. It also consists of helium (26%) and trace amounts of other elements — oxygen, carbon, neon, nitrogen, magnesium, iron and silicon.
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