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Models of the time after the big bang suggest that matter slowly “condensed” into atoms, but at the beginning it could only form hydrogen.
All elements smaller than iron could form in the core of stars. The heavier the element the bigger and older the star would have to be.
Elements heavier than iron only form in supernovae, when a huge star explodes and smashes elements into each other.
So the existence of heavy elements on earth is proof that the sun is a later generation star, that formed from the debris of stars that died before.
Since we are entirely formed from elements found on earth (by eating/breating, or by your mother eating/breathing while you’re still in the womb) we must be made from former stars.
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