Everything contained in our observable Universe came from that event, and everything we perceive today can be traced back to that origin in time.
The Greatest Cosmic Puzzle: Astronomers Find Stars That Appear Older Than The Universe
Ethan Siegel

Wait, how do we know this for sure? Could there not have been a ‘pocket’ of material that was the big bang, which upon expanding met up with the already-born results from another exploding nucleus of matter, fusing into one ‘universe’ with starts of differing ages?

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