> Is the reason you say that a consequence of relativity theory is that time isn't exactly a property of the universe because the 4 variables of spacetime are a

> Is the reason you say that a consequence of relativity theory is that time isn't exactly a property of the universe because the 4 variables of spacetime are all distances [(c*t, x, y, z)] as opposed to having 3 variables being distances and one time [(t, x, y, z)]? Or is it simply because Relativity proves that time isn't universal etc ? Yes, pretty much that. The "units" of z remain constant/consistent independent of the values of x,y. However, t, cannot be thought of separately in the same way. The experience of/speed of/duration of/distance of/... of t is dependent upon the x,y,z location.