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Originally Posted by Yakk
CSFilm/d*d, while there can be a closed universe, this isn't guaranteed.
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true - it could be an open universe where it keeps expanding and never contracts, if the force of gravity is not enough to overcome the force of the expansion.
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Originally Posted by Yakk
Take your baloon. Now make it flat.
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That renders the ballon analogy useless
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Originally Posted by Yakk
Flatter than that. Expand it out until it is a limitless plane.
Now, draw on that plane a grid, with the grid lines 1 cm apart.
Next, imagine the entire plane getting stretched, so the grid lines are 2 cm apart.
Notice that this plane didn't expand into anything. All of this action happened within the plane itself. Which points out flstf's error. =)
The universe isn't the contents of the balloon. It is the surface of the balloon.
The real trick is to now imagine this in 3 dimensions. Draw a scaffolding over reality. Now imagine the distance between the scaffolds getting larger, and everything moving with it.
We now have a limitless space (infinite in scope), that expanded by a factor of 2.
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The problem with this analogy is that there is a centre to the expansion described, this is not the case with the universe.