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I find this fourth dimension business tricky to get my head around (in fact I believe it to be impossible for us to truly comrehend) if we take a dimension away it becomes more easily digestable. this expansion of the universe is not as it sounds - an expansion from a central point, because the whole universe is moving away from itself in every direction,
if you were to draw points on a deflated balloon and then blow the balloon up all the points would move away from each other in a similar fashion but the central point of expansion is inside the balloon i.e not on the surface with the dots. Theoretically time is the dimension from the centre of the balloon to the surface, works fine with a 2d surface chuck in a third dimension and suddenly it hurts to think about it
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