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Originally posted by Astyanax I think you misunderstand, SugarCube. The evidence doesn't come from watching supernovas and galaxies expand. It comes from observations that clearly show light from very faraway objects undergoing a nonlinear increase in redshift with distance.
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I fear my links have been falling on stony ground. I provided the references for all this stuff in earlier posts.
Originally posted by Astyanax No, the universe does not have a centre of that kind (i.e. a point). Its expansion is isotropic, not outward from a point - just as is, incidentally, that of an inflating balloon. The expansion is everywhere the same; it is counterbalanced by gravity in the presence of large concentrations of matter (which is why galaxies and ATS members don't fly apart), but it is still very much there.
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This isotropic expansion is also the reason why the 'rip' in space shown by your diagram does not occur.
Originally posted by Astyanax Again, (the limit of space) is a misunderstanding, somewhat similar to spy66's: the universe is not contained within anything, nor is it expanding into anything. There is no evidence for boundary effects at the limits of the universe; we cannot, in any event, observe those limits, since parts of the universe are moving away from us faster than the speed of light.
Originally posted by SugarCube
reply to post by Toughiv
So, here is a diagram to help explain my previous posts:
[atsimg]http://files.abovetopsecret.com/images/member/c0c47b8f7240.jpg[/atsimg]
[edit on 3-6-2009 by SugarCube]
Originally posted by SugarCube
In quoting your original post, I was not indicating the expansion of supernovae and galaxies within their own right, but as point markers within an expanding universe just as you have explained. My own point was that the expansion of these notional markers does not preclude an expansion of the space boundary behind which they reside.
Originally posted by Toughiv
Imagine spacetime as the balloon and the air inside matter, i dont think it works like this. That is what i was trying to get at. More like the balloon is the extremeties of Matter itself.
I know Time + Space exist, but they only exist because of matter.
You dont know that mankind wont be around at the time
Funnily enough the End of the Universe has been prophecized in a lot of religions.
Originally posted by Astyanax The objects being observed don't reside behind any boundary, unless you mean they're beyond the zone of 'nearby' galaxies for which the Hubble expansion is linear; these objects still occupy the same space we do and it isn't as if we've seen them moving in the sky or anything.
As for other geometrical models, WMAP and its ilk have joykillingly eliminated every possibility - all those anyone has been able to think of, anyway - but one: boring old flatness. It's a pity; that toroidal universe of yours would be fascinating, cycling through endless repeats along two of its dimensions.
For the acceleration to increase, we would have to consider another impetus, caused not by the kinetic energy of the big bang but by a different phenonema.
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reply to post by MatrixProphet
Originally posted by MatrixProphet
Originally posted by SugarCube
For the acceleration to increase, we would have to consider another impetus, caused not by the kinetic energy of the big bang but by a different phenonema.
I want to ask; what phenomena?
Is it not possible that gravity is weak because of its penetrating or concentrating by the many branes of dimensions, as gravity is not bound by branes?
If our universe and possibly others are actually membrane bubbles, how would this effect any expansions?
We've left string theory out of this discussion so far and, personally, I couldn't be more pleased bout that. String clarifies nothing, simplifies nothing: it just multiplies entities unnecessarily. However, it's your call. Explain what you mean, with references, if necessary, and we'll discuss it.
For all we know there really could be a God cavorting about the place. Maybe He's just a little girl blowing bubbles. But then we are forced to ask: where did she come from?
So we cannot use the familiar forces to access these dimensions only the force of gravity can move into these other dimensions. So our only hope is the force of gravity to enter these other dimensions, and getting direct evidence that they are there.
String theory consists of tiny little strings like a rubber band each vibration of the rubber band corresponds to sub atomic particles. That is why we have thousands of these sub atomic particles which are not particles at all. They are nothing but musical notes on a tiny vibrating string. - Dr. Michio Kaku, Professor of Theoretical Physics