Solved: The mystery of the expansion of the universe

Discussion in 'Astronomy, Exobiology, & Cosmology' started by paddoboy, Mar 10, 2020.

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  1. Jan Ardena

    Jan Ardena OM!!! Valued Senior Member

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    That doesn’t make sense, unless you are implying the Big Bang exploded into something.
     
    Jan Ardena, Apr 16, 2020
    #21

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  3. Derek.H.

    Derek.H. Registered Member

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    No doubt , but...
    How fast did it happen...by OUR current standards and perception ? Not if you were in the beginning Universe , but rather , you could watch it unfold from HERE/ NOW (not with ancient lightwaves) .
    D.H.
     
    Derek.H., Apr 16, 2020
    #22

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  5. paddoboy

    paddoboy Valued Senior Member

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    That's like asking to put yourself in the same frame of reference as a photon...irrational and impossible.
    The BB was everything...all of space and all of time. There was no center and no edge. While you may find that counter intuitive, I suggest it is far more counter intuitive and plumb crazy to believe in some unsupported myth.
     
    paddoboy, Apr 16, 2020
    #23

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  7. Jan Ardena

    Jan Ardena OM!!! Valued Senior Member

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    “Everything” that came into being, and is currently expanding as a result.
    What could have caused this to happen?
    “Nothing” cannot be shown to exist at all. It is the very meaning of what it s to be intuited as the origin of the the Big Bang.
    We only use nothing as an opposition to something. It has no Intrinsic value at all.
    So I disagree with you on that point.
     
    Jan Ardena, Apr 16, 2020
    #24
  8. paddoboy

    paddoboy Valued Senior Member

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    As you have been told before, we don't know, but some educated and promising speculation does exist, which you have also been informed of.
    You can disagree all you like based on your incredulity concerning nothing and what existed before t+10-43 seconds.
    It is though far more incredulous and hypocritical to then say god did it, when we have absolutely zero evidence of such a mythical creature. The same question then of course can be asked about this creature you label god.
     
    paddoboy, Apr 16, 2020
    #25
  9. James R

    James R Just this guy, you know? Staff Member

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    The usual analogy that is used is to imagine that galaxies are dots drawn on the surface of a balloon. The two-dimensional surface of the balloon is analogous to space in this analogy; it is important to appreciate the the three-dimensional interior and exterior of the balloon are not part of the space being considered. Now, as the balloon is inflated, every dot on the surface moves away from every other dot. There is no dot that can be said to be at the "centre" of the balloon's surface. The surface has no centre. The only "centre" lives in a higher-dimensional space.

    Similarly, our own three-dimensional universe expands in such a way that every galaxy moves away from every other galaxy (except for some locally-bound clusters). There is no "centre" to the three-dimensional space. There is nothing "outside" for the galaxies to expand "into", just as the 3D space outside the balloon's surface is not part of the surface itself.

    Bear in mind that this is an analogy. The full description is a mathematical one, which is rigorous and tested.

    Hope this helps.
     
    James R, Apr 16, 2020
    #26
  10. paddoboy

    paddoboy Valued Senior Member

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    Nice analogy agreed. We can also use the raisins in the baked dough analogy.
    Jan's usual loaded questions though concern where and why the BB did bang and the defining of the nothing from which it evolved. This has also been explained to him elsewhere.
    My own explanation as a layperson was that we can only know with any sort of confidence back to t+10-43 seconds, and prior to that we can only speculate. On that speculation, my take aligns with the Krauss speculation, in that the BB probably arose from a quantum fluctuation, in the quantum foam, the quantum foam, being that which most likely has existed for eternity, and which is as close to nothing as we can get and is essentially nothing.
     
    paddoboy, Apr 16, 2020
    #27
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