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If a person on Earth today is looking at a star, say, 10 billion light years away, is it possible that some of the atoms he is looking at will eventually go on to make him?

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I don't think so because the atoms would have had to travel faster than the speed of light to get to you (to form you) before the light they reflected got to you, and from what I understand, nothing travels faster than light.

T-Fox
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