Daminc said:
If the Universe is expanding at an accelerating rate then it would appear 'that everything is moving away from everywhere' and this phenomena would be evidence for a single point of origin, surely?
Hi Daminc
It is a hotly debated topic. The point of origin you seem to be inferring is often called a singularity. Singularities are fairly common in math, but not seen in physics. We have ample evidence of something going on at the center of many galaxies, called a black hole, and it seems to be something like a mathematical singularity, but we can't see them directly. Stephan Hawking is probably the most prodigious popular authority on this question. He recently reversed himself on one of his major findings, the question of whethor any information going into a singularity can ever come out again. Currently, if I understand correctly, he thinks some information might be able to get through.
Anyway I think the important thing for you is to keep working your imagination, and don't get stuck or overly attached to any "fact", or opinion or idea for that matter. You have been thinking rather deeply about space and have apparently begun to think about time as well.
Lets take a look at what you have so far. Hubble (and countless later astronomers) tell us that the universe is expanding in all directions. If we run the process in reverse, and look (with our imaginations) back in time, we expect that the universe should have begun in some region. Curiously, if we do this with the observables and the maths, we find that the universe started right here.
There is still the question of where, exactly, right here is. Does "right here" mean here in The Milkyway Galaxy? Or does it mean right here in our arm of the spirol? Or does it mean right in our own solar system? Right here on Earth? Right here in Hubble's eyeball? Which cell in the retina?
Singularities are far smaller than eyeballs. You see, if the singularity were the size of Hubble's eyeball, there would be plenty of room for all kinds of information to get through. Some of the infalling stuff would miss some of the other infalling stuff and so would go raceing outward again. That is not a singularity. If all the infalling stuff goes to a single point, nothing can come back out again. It all cancels.
So maybe the singularity is more than one point, maybe it is two or three or some small countable collection of points. Then the infall might cancel out almost everything, but something might still slip through the middle and come out...where? In another Universe? But if there is another universe, then there is more than one universe, so they are not universes at all, since the universe by definition is only one thing. Sadly, this line of thought reduces to the absurdity of semantics
Things get worse when you add time as a dimension. If the singularity is the first instant of the universe, what came before that?
Consider Euclid's fifth postulate, regarding the existence of parallel lines. If the universe begins in or ends in a singularity, then all lines must converge there, so no lines are parallel and Euclid's fifth is false. Ouch. There is a whole mathematics built on that presumption.
I am still trying to figure all this out myself. Euclid is responsible for most of our ideas of ordinary local space. But there are other ideas. There is deSitter space and anti-deSitter space. Robinson_Walker space (I don't know what that is but I saw it written somewhere IIRC) Riemann space and Minkowski-Einstein space. Each of these variations has some small difference that turns the others upside down, inside out, or frontward for backward or something. You can try to keep all the names straight if you like, I am not good at that.
Then string theory comes along to add a bunch of hidden dimensions. Yikes.
I suspect that the answer in the end will be overwhelmingly simple. Probably 42 or 43 or some modulus added to one of those. Even Penrose pokes fun at himself with his subtitle. Douglas Adams is more fun to read and IMHO may have a better grasp on Reality. But then, Penrose may be a fan of old Bing Crosby Bob Hope movies, I don't know.
My advice is that you should enjoy the summer. Ponder the singularity at the heart of a violet while lying on your stomach in the grass, and don't forget to breathe. We are tiny creatures in an immense Universe.
Be well,
Richard