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Most of them are 5 billion years old or older. They were formed in stars by thermonuclear fusion. When those stars became novae or supernovae, the atoms were blasted out into space. Some of these would have formed the stellar nebula from which our solar system condensed. Since the sun is around 4.5 billion years old, these atoms, which must have become part of the solar nebula before that, must be older than 4.5 billion years.

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9y ago

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