Okay another question. Is time necessarily a dimension ? Could it not be a factor realted to the very nature of space rather than a dimension equivalent to the spacial ones ? Time is very clearly different from the other dimensions as it makes no difference which direction you move through them, wheras with time direction is necessary and fundamental. Could it not be that physical matter by its presence takes energy from this "property", and so the bend of gravity in space-time is in fact a region of "lower energy" time ?
