Expansion Methods

[LJP07]

This is about the Universe expansion. If the Universe of have expanded to today and continually expanded, then at one time it must of been a point. Now from this point, it expanded. But if it spread out evenly out in all directions and there is no movement except the expansion, then can you find the centre of the Universe? Surely information at this point in even expansion took place would boost more information for Physicists, I don't know that's why I'm asking?

Secondly, is it possible for expansion to of took place in two paths. Think of the Hourglass Nebula or just an ordinary Hourglass. This means expansion in two paths. If it did take place in two paths and expanded by this method, then surely the two of them would be side by side through even expansion, which could give rise to parallel universe, I don't know, if not Parallel Universe then split Universe then, would that be viable?

Thirdly, could the Universe of expanded within another Universe. This implies that for example think of a bubble, sometimes another bubble can expand within that bubble, but the original bubble could be infinitely big and we formed as part of the larger Universe, the last one doesn't sound too good but for some reason have always thought about it?

It's important that we grasp and try to understand the Universe and dimensions and methods, which is what this threads about.

[sanctus]

Why does it have had to be a point at one time, there can be a continual expansion without having a point at some time...

[Tormod]

Originally Posted by Prolu2007

If the Universe of have expanded to today and continually expanded, then at one time it must of been a point. Now from this point, it expanded.

This is a common misunderstanding. Just read what you wrote again: if the universe once was point-sized, then the point was the entire universe. Ergo, the point grew into what we see as our universe *today*, and therefore everywhere can be said to be the centre. In other words, the universe has no geometric center.

Secondly, is it possible for expansion to of took place in two paths.

I think it's safe to say that anything is possible. However, we cannot yet prove or even point to evidence that this has happened, so it can only remain a speculation.

Thirdly, could the Universe of expanded within another Universe.

This is again a possibility and one which many people think is likely.

I don't want this thread to be about everyone elses expansion ideas, just the ones I mentioned and to be discussed, critizised or welcomed?

The ones you mentioned have all been discussed before and are not original in any way.

But why do you not welcome other expansion ideas? I recommend fleshing out your ideas if you want them discussed thoroughly - as they stand now there is not much to discuss, really.

[LJP07]

Didn't think my methods were previously discussed, will use search a lot more. , and ok people can promote thier own ideas I suppose

So Tormod, you say that there is no geometric centre of the Universe. If I inflate a balloon it continually expands and if I put markings on it like X and Y, these letters will further distance themselves so it's a good example. So imagine a balloon expanded to it's fullest. You can find it's geometric centre because :

A : You can find it for the balloon.
B : The Universe is not moving it's expanding from a certain area that was once the centre or the site of expansion is another way of putting it.

If you freeze time, where the Universe was the size of a tennis ball in your hand. The centre can be located or at least the area around it.

[Buffy]

You're thinking in three-dimensions though. The actual analogy is to think of that balloon being a two-dimensional view in a three-dimensional universe. As you blow up the balloon, everything on the surface moves away from everything else, but there's no "center" of the expansion anywhere, although from any point, everything seems to be expanding away from you evenly in all directions.

Now expand this concept to us 3-d beings in a 4-d universe. Everything moves away from us evenly in all directions. If there *was* a center, either one side of us would be moving away from us more slowly than the other, or we would just happen to be at that spot in the center of the universe's expansion. Since we don't see any differences in velocity and its provable that our location has shifted locally, its pretty certain that this weird interpretation is the case.

This is hard to conceptualize and always has been.

Isotropically,
Buffy

[sanctus]

Originally Posted by Buffy

everything seems to be expanding away from you evenly in all directions.

Isotropically,
Buffy

Is it really evenly? I mean hubble's law...which seems to valable at least on sub-horizon scales...

Homogenousically,
Sanctus

[jackson33]

this is from, my perspective which they call SS and is simply stated our universe is as its always been...ie. no big bang, no need for expansion but of no importance.

1- there would seem to be no reason to expand...

2- everything we see in the known universe has movements, but not always to the same direction. we see galaxy colliding, dwarf galaxy being absorbed. some think spirals became this from near contact with others and axis or tilts of all spiral are not the same.

3- many feel there could be other universe outside ours. these should not be spilling over or in any way effected by the others, which is not true with in any one. along this line; we could be part of something much bigger and as an atom is to matter.

my view is that there is a center of the universe. someplace where most all the rest is of equal distance. (not for cause or reason) where this might be i have no idea, nor does any one else...

[InfiniteNow]

Originally Posted by jackson33

my view is that there is a center of the universe. someplace where most all the rest is of equal distance.

Where, then, is the exterior edge by which these are measured.

[jackson33]

if i could tell you where the edges were, i should know where the center is...

when we speak of known universe, this is in equal distance to all directions from us with an apparent consistency of matter. this tells me the universe should be at least twice what we think and my guess its many times this. that is if there is this consistency to what is seen, likely it extends at least this much more, or at some point we will find nothing or super mass in one direction. 28-30 billion light years across known, my guess at least 60 bly and probably much more.

[Tormod]

Originally Posted by jackson33

when we speak of known universe, this is in equal distance to all directions from us with an apparent consistency of matter.

You should really say the observable universe, as there is (as of yet) no way we can say anything about what is outside what we see.

The observable universe is a sphere, with us at the centre.