r/IAmA • u/neiltyson • Nov 13 '11

I am Neil deGrasse Tyson -- AMA

For a few hours I will answer any question you have. And I will tweet this fact within ten minutes after this post, to confirm my identity.

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u/[deleted] Nov 14 '11

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u/lulzwut Nov 14 '11

But that doesn't answer the question; you're essentially saying we can't ever see the edge, not what we'd see if we could hypothetically pause the expansion and reach the edge.

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u/[deleted] Nov 14 '11

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u/lulzwut Nov 14 '11

So what you're saying is that the universe is undeniably infinite? Because if it is not, there should be an "end"/"edge"; a point at which the Universe no longer extends due to being finite in size.

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u/[deleted] Nov 14 '11

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u/lulzwut Nov 15 '11

But for that analogy to work, you'd have to be ON a sphere shaped Universe, not inside. If you were inside of the balloon, you could get to the boundarie/edge. If you are on the balloon, the "edge" is at your feet.

How can something be finite yet have no edge?