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If the universe was created by the big bang, and is expanding, doesn't that imply that it has a size and shape? So then, does that not also imply that it has an edge?
No. All 4(pi) steradians of direction at every location in the universe point exactly at the Big Bang. Every point in the universe is at its exact center. The universe is finite but unbounded. You can only see that part of it within your light cone.

The Big Bang was not an explosion in space, the Big Bang was an explosion of space. It made for an interesting geometry. Be glad that the resulting volume is orientable. OTOH, we could use more surface area/volume. My desk is a mess. Go hyperbolic!

Uncle Al
http://www.mazepath.com/uncleal/
(Toxic URL! Unsafe for children and most mammals)
http://www.mazepath.com/uncleal/qz3.pdf