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  1. R

    Space and the big bang

    There is no such thing as "nothing". And the Universe isn't expanding into anything. The space-time is expanding. That's it. It's not contained into anything. But what I meant to say is that at the present moment the expansion of the Universe is accelerating, so it seems that it will just keep...
  2. R

    Space and the big bang

    That is what seems to be happening. But in theory it is not the only possibility.
  3. R

    Space and the big bang

    it's not really the same. Using your thought then the size of the Universe has never changed? Also matter doesn't contract. How can you contract an atom, or even better, an electron?
  4. R

    Space and the big bang

    The Universe is the space-time. And at that time all the Universe was that marble of mass. space-time outside the Universe makes no sense. :) R.
  5. R

    Regarding the Big Crunch

    Indeed. i was being careless in the words used.
  6. R

    Without Dark Matter and Dark Energy

    an example of a model that doesn't take into account dark matter and dark energy is the Einstein-de Sitter Universe. In such model, the size of the Universe goes as t2/3. (And the Universe is assumed to be flat, which seems to be the case anyway) It was thought to be quite accurate until...
  7. R

    Regarding the Big Crunch

    space without matter is useless. You can't interact with it, because there is no matter. you can't even see it, because there is no matter. Also the fact that "nothing" is inside it would make it not exist. (it's a weird concept, i know. but there is just no such thing as "emptiness")
  8. R

    Regarding the Big Crunch

    you are assuming that space can exist without the presence of matter.
  9. R

    Regarding the Big Crunch

    Well, the thing is that "nothingness" can't exist. There is just no such thing. Try with this interesting thought: Imagine a room. Nothing can be outside of it. The room is your Universe. The room is full of objects. Maybe you can't see them, because they could just be particles such as...
  10. R

    Regarding the Big Crunch

    Yes, i would say so. R.
  11. R

    C.M.B.R. and popular science.

    I would just say that the energy of the photons that are still travelling from the moment when the Universe became transparent has decreased substantially as a result of the expansion of the Universe. But the idea was roughly right.
  12. R

    Regarding the Big Crunch

    Good point, it should be dark energy. But the difference is subtle, so it doesn't really matter. R.
  13. R

    Regarding the Big Crunch

    Ok, let's talk a bit about the background of the big crunch theory because there are some confused ideas here. If one studies Friedmann's equation: \dot{R}2 = \frac{8}{3}\piR2 - k + 1/3\LambdaR2, where R is the scale factor of the universe and depends on time, k is the curvature of the Universe...
  14. R

    Regarding the Big Crunch

    Dark energy causes the expansion of space itself (at least this is the current understanding, but we don't really know what dark matter/energy is!) If there will be a contraction, space itself will contract so I am not sure what you're really saying about matter, gravity and space. Try...
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