Quote:
Originally Posted by dcl
[...] It would be very difficult for the inhabitants of our disk-shaped world to conceive of the possibility that our universe is merely the surface of an expanding sphere. They would tend to think that they lived on a flat infinitely large surface.
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They might, but what is the point? We don't live in 2-D but in a 3-D universe. Those of us who know about 3-D curved spaces (mostly mathematicians) can imagine that the universe is just such a closed curved 3-D space. Once I explained how it works in practice and if someone is interested I might do it again. I don't see many folks interested in this thread though.