My question related kind of to asking what the shape of the universe is. Say a hypothetical alien civilization built an faster-than-light spaceship. If they keep flying would they end up where they began? ie space itself is curved...or would they hit some invisible barrier?
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We can't peek deeper than a certain distance away from our current cosmic position, but we know for sure that the universe extends far beyond that cosmic horizon. In fact, for all we know, although our observable universe is finite, the full universe is infinite in size.
If this is indeed true (and there is no single piece of evidence against an infinite universe), the universe started infinite in size, and it has been expanding ever since. It is true that going back in time based on our deepest laws of physics we hit a singularity, but this is a temporal singularity, not a spatial singularity.
Johannes
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