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The Sun's Origin, Composition and Source of Energy

Origin: The Sun and its planetary system formed from heterogeneous debris of a supernova 1 that exploded 5 Gy ago 2 . Meteorites and planets recorded this as decay products of short-lived nuclides and linked variations in elemental and isotopic abundances 3-11 . Cores of the inner planets grew in a central iron-rich region; the Sun formed on the collapsed SN core.