if there are 3 dimensions in space, and 1 in time, what are the other 7 that are theorised?

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This might be a bit much for eli5, but I find any googling yields results far too complex for me to understand. Ive heard that there are up to 11 dimensions. If up/down, left/right, and forward/back are the 3 spatial dimensions, what are the others? And what of time being a dimension itself?

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