Can someone point me to another dimension?

[Trantor]

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This post will give away my lack of education, but here goes..
Has any other dimension been proved? I know string theory relies heavily on multiple dimensions, but as I understand things this is the exact problem with string theory. It is completely untestable and likely never will be.

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Not proved but there are certinly tests proposed to investigate/test the various theories. They wouldn't be scientific theories otherwise.