Quote by westerross
If you head off to the outer rim of the universe I think the theory is you never reach it because you start travelling asymtotically to the outer rim. Hence the universe is infinite and so you can't reach the edge. If you do and you've got a Red Bull in you you might find the answer to Rocky's question.
Any volunteers? I think it requires quite a lot of dedication!
The universe may not have an edge: The galaxies are on the whole moving directly away from us in all directions, which places us at the exact centre of the universe. But, assuming there's nothing special about us and the universe looks the same from any other vantage point, that would mean it has no absolute centre and therefore no edge, but that doesn't necessarily mean it's infinite:
Consider the 2 dimensional surface of a 3 dimensional sphere. Make it a balloon with dots drawn all over it. Slowly inflate it and look at the dots. From the point of view of any particular dot, all the other dots are moving directly away and the space between them is expanding. There is no absolute centre to the surface, every direction is the same and you can travel right round it without reaching any edge. The universe may be similar by analogy - the 3 dimensional surface of a 4 dimensional 'hypersphere', which, like the surface of the balloon, is finite and yet has no boundary.
I will continue later, hopefully I'll be pissed enough to go into outrageously weird detail about Life, the Universe, and... Stuff.

Ice