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Universe Or universe? It All Depends On The Multiverse

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3D Universe Map Shows Most Complete Detailed Image Yet
(image by CREDIT: T.H. Jarrett (IPAC/SSC))

We know that the information we can obtain about the cosmos, what we can 'see,' is limited in two ways. First, since nothing travels faster than light, information from a far away object like a galaxy takes time to reach us. Second, the cosmos we live in is time limited, starting 13.7 billion years ago in the event we call Big Bang. Putting the two together, we conclude that, at most, we can receive information from objects that emitted it 13.7 billion years ago. A bit more precisely, since the first stars and galaxies appeared around 200 million years after the 'bang' [i.e., 'seed'], our limit is for objects that emitted information some 13.5 billion years ago. We just don't know if the multiverse exists. Worse, it seems to be impossible to confirm its existence, given that it naturally extends well beyond our Universe. Concretely, we only have our Universe.

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