it will be a long time before your universe uses up the memory of even an ordinary computer
size has nothing to do with memory capacity. you can have a universe bigger than the known universe, and it will make no difference to any computer. the size of the memory required is a function of the number of objects described. you can save web pages all day, and take lots of pictures, and do assorted other things, without approaching the memory capacity of even an ordinary computer. this is sort of true.
