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I can see that you had trouble understanding physics at school
I guess I did too. No-one has yet seen the big bang. If they could, the universe would look very different, as the clouds of matter had not coalesced into stars and other objects. The oldest galaxy seen by Hubble is estimated to be around 13.2 billion years old or 500 million years after the big bang. A lot happened in those 500 million years. Anyway, all it means is that it took the light Hubble is seeing now light 13.2 billion years to get here so it is a long way away. Hubble is seeing light waves by the way, not atoms.