No-one knows if the universe is finite or infinite. No-one knows what shape it would be on the outside. That's because all we're aware about in the universe is that range of it that is visible to us, and that is limited by the speed of light and the age of the universe. The universe is about 13.75 billion years old, and we can only see those parts of the universe that were close enough for light to have reached us in that time.
In terms of expansion, it's not necessarily the universe itself that is expanding (although that might be happening too), but rather that everything in it is spreading apart.
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Spending as long as I do here, it's easy to forget that Oddworld has actual fans.
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