B How is the Big Bang compatible with an infinite universe?

AI Thread Summary
The discussion centers on the compatibility of the Big Bang theory with the concept of an infinite universe. It clarifies that the Big Bang did not originate from a "small point" but rather occurred everywhere simultaneously, challenging common misconceptions. The observable universe may be finite, but there is no definitive evidence to confirm whether the entirety of the universe is finite or infinite. The expansion of the universe can occur in both finite and infinite contexts, and the idea of a "wrap-around" universe is introduced as a potential model. Overall, the conversation emphasizes the complexities of cosmology and the limitations of current understanding regarding the universe's structure.
  • #51
Promytius said:
An event, referred to as the Big Bang, that happened in our past was not the beginning, but a local beginning; after requires a before. It's a theory, not a fact; it's an elegant, incomplete notion to help us mentally wrestle with things of which we are not yet capable of insightful and complete penetration. So at one point in one point one thing happened and we gave it a name, but it is just one of an infinite number of events, some of which may be quite the same; for in an infinite universe or an infinite multiverse, all things exist.
Space - the rest of everything - has to be infinite, because an inside requires an outside, and an outside would define not-an-end and require a further container.
Consider the argument that for any position, there must be left an right, therefore unless 'chopped' any surface is infinite. Then consider the surface of a ball (2-sphere). Your argument is assuming Newtonian time & space in a scenario where all evidence suggest they are wholly inaccurate.
 
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  • #52
PAllen said:
Then consider the surface of a ball (2-sphere)
Then consider the torus it swipes out of space, then twist it for 1/2 a loop and you are almost there.
 
  • #53
Promytius said:
So at one point in one point one thing happened and we gave it a name, but it is just one of an infinite number of events, some of which may be quite the same
I found your whole post incoherent, but this sentence in particular is just weird.

; for in an infinite universe or an infinite multiverse, all things exist.
No, all things do NOT exist. There are lots of things that are physically impossible and none of them exist
Space - the rest of everything - has to be infinite, because an inside requires an outside, and an outside would define not-an-end and require a further container.
Again, you are not making sense. I realize that you think this makes sense but it does not follow. The universe does not have to be infinite.

Perhaps if you could address your points one at a time rather than in a jumble, we could address them.
 
  • #54
This thread has run its course and is now closed.
 
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