Big Bang - No Single point of Expansion

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The discussion centers on the concept of the universe's expansion, emphasizing that it does not originate from a single point but rather involves the creation of space itself as it expands. Participants express confusion over the notion that space expands into "nothing," challenging the traditional view of the Big Bang as an explosion from a singularity. The balloon analogy is highlighted to illustrate that all points in the universe are moving away from each other without a central point of expansion. There is debate over the interpretation of singularities and whether the universe is infinite or "bouncing" from a previous state. Ultimately, the conversation underscores the complexities of understanding cosmological principles and the limitations of human intuition in grasping these concepts.
  • #61
Dmitry67 said:
I am listening to your Nobel-prize-winning theory :)

Please don't encourage personal theories. As per PF-rules, they belong only in the IR section.
 
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  • #62
It was a sarcasm.
 
  • #63
Prior to 1912 and the discovery of red-shifted nebulea, the universe was thought to be fixed,immutable and perfect. The handiwork of God. We now know that it is, at best, a work in progress. Being thought perfect, it was stated by somebody who should have known better, that it would look the same no matter from where it was viewed. As this was in the nineteen teens, there could be no possible scientific basis for this statement. It was, at best, guesswork, and as such was foolhardy. I defy anybody to provide evidence that was known at that time, that could back up this claim.
With regard to expansion, I didn't say that the universe is not expanding, indeed the outer regions still are. What I said was that the "faster with distance" view could be produced by either an expanding or a collapsing universe, and that in 1929 they could not have known which it was. With the further information that we have today, they probably would have stated that collapse is more likely to be occurring than expansion.
With regard to the balloon analogy, this one dimensional surface is what the universe would resemble if escape velocity had been reached. There would, of course, be no clumps of matter, only the particles of the early, energy only universe.
So tell me, what is it that this forum has against the notion that gravity is exerting restraint from within that has caused the faster with distance view through slowing from within and that this produces the illusion of acceleration? It would seem entirely logical, obeys all physical laws and does not require the invention of a new force in order to explain things. We're not talking warp factors here, or time travel, merely interpreting information to produce the simpleist and easiest of answers.
 
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  • #64
Oh Peter its not just this forum...Go to any astronomer and just ask what they believe is the current best theory behind the universe's future. Your assumption could be possible if there WAS a center but there isn't. Period. Also the balloon's surface is suppose to represent 3D. With the raisin bread, just imagine it suspending in nothing while expanding. No baking pan.
 
  • #65
So why then does the einsteinonline website, which is heavily promoted by this forum, state categorically that the outward movement can be rewound to a single point? It also provides a pictorial representation which is essentially a "slice of pie" illustration whereby the universe is seen expanding from a single point. This type of picture is quite widely used and is to be praised for it's economical use of paper and ink. It is though, misleading. To understand fully what the universe is doing, simply fill in the rest of the pie and engage brain.
 
  • #66
Peter Watkins said:
So why then does the einsteinonline website, which is heavily promoted by this forum, state categorically that the outward movement can be rewound to a single point? It also provides a pictorial representation which is essentially a "slice of pie" illustration whereby the universe is seen expanding from a single point. This type of picture is quite widely used and is to be praised for it's economical use of paper and ink. It is though, misleading. To understand fully what the universe is doing, simply fill in the rest of the pie and engage brain.


Please do. I am done. I seriously thought this was a joke ...
 
  • #67
So it's back to school for you then.
 
  • #68
Actually I am in school. I guess I will go back tomorrow then? Whats so hard to grasp about the Big Bang happening everywhere since there was no universe before it? Its hard to picture but it makes perfect sense. So maybe...
Peter Watkins said:
So it's back to school for you then.
 

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