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You mean where is the edge? Some say there is a great ice wall. Not sure where the penguins migrate to or where my ancestor (distant) Captain Scott went. They will say you can't prove otherwise unless you actually go there.

There's also the issue of how a planet originates. The formation of planets is fairly well understood, but how would a flat one form? What's on the other side?

@steevc, thanks for this enlightenment.

lol! I hope to see the fairy tale ice wall some day.