The same chemicals as here on earth, in varying amounts. Our bodies are carbon, hydrogen , oxygen... the planet itself has many rocks eg limestone, which is calcium carbonate , and a lot of iron, for example the core is iron. The sun is helium and hydrogen for the most part. The moon is made of the same stuff as earth which is part of the evidence that leads us to believe it was formed by a large meteorite smacking into the early earth. Venus is a rocky planet with an atmosphere of carbon dioxide adn sulphuric acid. Jupiter is made of hydrogen, helium and ammonia. All the elements that exist have been formed by reactions inside stars that have lived and died, spreading their mass all over the universe when they go supernova. Older stars contain heavier elements (ie further down the Periodic Table).
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The sun is primarily composed of hydrogen and helium. Hydrogen makes up about 74% of the sun's mass, while helium makes up about 24%. Other elements, such as oxygen, carbon, and iron, make up the remaining small fraction of the sun's composition.