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Originally Posted by Jason
But a balloon does have a center even while it expands, and a grapefruit has a center.
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This is why they are called analogies. The balloon analogy is just that. The universe does not require a center.
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EDIT: In fact this Scientific American article seems to confirm that we are at the center of a "cosmic event horizen". Since there is no way to observe anything beyond this horizen, let alone travel there, we effectively are at the center of the visible universe.
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And, if you were five billion light years this way or that, you would still see as far, as noted in the article. There is nothing special about our location.
Anyway, if you're planning on arguing for Geocentrism, then I'd suggest taking it to ATM.