The observable Universe is all that we can observe and all that we think we will be able to observe that isn't in violation with known physics. For instance, it is possible to observe regions that are expanding faster than light, surprisingly, but only to those regions nearer to us. The more distant regions are expanding too fast for us to ever observe.
The redshifts, the time dilation of SN light profiles, etc. are clear examples of objective evidence that the observable Universe (the observable one) is expanding. To say there is "no evidence" is patently false.
What is your view on balloons? Do they expand, and if so, what am I missing that would suggest that the Universe is not?
Even if what is happening within the balloon were to be unknowable, it wouldn't change the argument that the balloon is expanding, right?
All evidence supports that the entire observable Universe is expanding. There is no evidence the contrary. To argue that the extra Universe is doing something different is pseudoscience, but like the balloon, it won't change the objective evidence of expansion.
Ok. We agree on the expansion of the BB Universe.
I think Universe refers to our universe that doesn't include imaginary regions outside of it to allow science to function properly. To included external regions to it, and no doubt they are there due to expansion and our limitations, serves no real purpose that can help us.
The redshifts, the time dilation of SN light profiles, etc. are clear examples of objective evidence that the observable Universe (the observable one) is expanding. To say there is "no evidence" is patently false.
Where on earth did I ever say the observable universe was not expanding?
What is your view on balloons? Do they expand, and if so, what am I missing that would suggest that the Universe is not?
Oh no, don't mention balloons, you'll start Catastrophe off again
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Go outside and blow a balloon up, now tell me what else is expanding with it, are your your surroundings expanding with it? ok, the atmosphere may be expanding by 10 x 10 ^ - 30 percent. Maybe a few atoms in the Solar System might be disturbed, but beyond the solar system I think the effect will be close to zero, so it is possible for something to expand in something else without affecting it.
Right no one will like what I'm going to say next because it is not science and it is not what the Big Bang Theory says, but it is how I get my head around the Big Bang Theory.
Look carefully at articles about the big bang you'll see three main features;
1. It Started From a hot dense patch (or if you're a stick in the mud, a singularity) i.e. it had a a finite size
2. it has a finite rate of expansion
3 it has a finite age
Taken together that means the big bang is on object.
Anything that exists occupies space.
Objects occupy space, they do not create all of space, as the proponents of The Big Bang Theory would have us believe. It may have created its own internal space, but it also exists in an external space at the same time.
This is why I've been using the phrase contents of Big Bang instead of universe, it's a finite entity. So now the contents of the big bang can be exactly equivalent to the balloon in your analogy. Bear in mind the balloon, for us, is composed of two parts; the observable part and the unobservable part, making the balloon the whole contents of the Big Bang. In The Big Bang Theory the whole contents of the big bang are called the 'Whole Universe' but this still must not be confused with the dictionary definition of Universe which means everything that exists, which may be more than the whole contents of the Big Bang.
To further inflame everyone, please note that my model now gives the big bang a boundary, a beyond and a centre.
So now, just as the balloon out doors does not expand all the space it is in, likewise the contents of the Big Bang need not expand the rest of the Universe that it is in.
Also, Universe means everything that exists, so bear in mind this could be infinite and it could have an infinite amount of stuff in it, which is also my view. In this case an infinite Universe can't expand because there is nowhere left for it to expand to, it is already everything.
This case is also why I've been suggesting that the contents of the Big Bang may not expand forever, it will meet up with the rest of the stuff in the Infinite Universe and stop expanding.
Even if what is happening within the balloon were to be unknowable, it wouldn't change the argument that the balloon is expanding, right?
Probably not, but bear in mind that the unobservable universe as per Big Bang Theory is estimated to be at least many thousands of times larger than the observable universe so you still can't say with absolute certainty what's happening in the unobservable part if it's so much larger. Logic would say it's all expanding, but the boundary as per my model, might have already hit the stuff in the rest of an infinite Universe!
All evidence supports that the entire observable Universe is expanding. There is no evidence the contrary. To argue that the extra Universe is doing something different is pseudoscience, but like the balloon, it won't change the objective evidence of expansion
my original statement was to say that you cannot state that the Universe is expanding because you cannot know no what everything that exists is. I did not say say that it may be doing something different.