Here is a good question to casually drop into conversation with the scientists at your dinner party. I that Are there other invisible dimensions besides the three known spacial dimensions (length, width hight). What you need to know in order to hold up your end of the conversation. Is that up until now there has not been a theory capable of explaining why we unable to recognise precisely 3 spatial dimensions. The realistic theory and quantum field theory can be formulated for many spatial dimensions as desired. If you're up to speed on the space and time debate. Here's a good follow up question. Why do we only have one dimension of time? The Swedish MIT cosmologist Max Tegmark researched the case with a time dimension m=1 and the varying number of spatial dimensions. n the result.
n<3 insufficient complexity (no gravitation).
n>3 insufficient stability (unstable solar system).
m<1 or m>1: insufficient casualty. (Physics would lose its ability to predict).
What does this mean?
Recent theories suggest a multi-universe in which the spatial and time dimensions vary from universe to universe. In this model Tegmark concludes that our universe has 3 spatial dimensions and one third dimension. Universes with other dimension ratios are probably uninhabitable.
Which is easier for you to imagine. Having no space or time?
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