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June 7th, 2018, 02:23 AM   #11
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Originally Posted by Denis View Post
It's impossible that there was a "start"
Is it? There's no evidence to differentiate yay or nay. Everyone can agree that if you take an expanding universe and extrapolate backwards in time, you get a smaller and smaller volume of space, but was cosmogenesis the beginning of "everything"? Some cosmologists hypothesise that there are many crunch/big bang cycles, in which case the big bang we observe is just one of many that have happened. Furthermore, some hypothesise that the observable Universe may just be part of a bigger Universe with many big bangs in it, in which case the "start" is just the moment in time which corresponds to the big bang that we observe with the rest being beyond the observable universe. Again, there's no evidence to differentiate any of this stuff, but it provides context and reveals just how little we know about our own observable Universe at the largest scales.

, so there never was "nothing".
But that doesn't necessarily follow either, because we don't know how cosmogenesis happened, so if the there exists repeating crunch/big bang cycles, the "start" would be the beginning of our current big bang cycle, but there would have been matter before it.

Therefore universe always existed...something we'll never
be able to explain.
Certainly not in our lifetimes, but who knows what signatures we'll find in the CMB or other observed phenomenon from the early Universe.

Cosmology is a nascent field and is developing all of the time, but it is easy to ask difficult questions and very difficult to find answers.
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June 7th, 2018, 09:01 AM   #12
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Given the horizon caused by the expansion of spacetime I think there are going to be questions we simply will never have the data to answer.
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