In fact there are an infinite number of dimensions after the fourth dimension of time. (Space is defined by the first 3 dimensions.) It does not stop at nine. The higher dimensions can represent many possible things. For instance I have seen them used to represent possible connections in a complex telephone network. They can be used to understand the many phases of modern radio signals. Or how about the unusual nature of time and space inside a black hole? Higher dimensions have countless applications in physics, math, and engineering to name just a few.