our world is but a small blip in a galaxy containing countless dimensions and (presumably) infinite space. loads of people can hardly grasp the 4th dimension though, so don't bother yourself too much about it. I mean, 4D movies? you have know use for the knowledge, but it can be explained in axis. [1 is hight, 2 is width, 3 is depth, 4 is time] but I do not know the rest.