I have a theory and I was wondering if there is either a chance it is true, or if the theory has already been proposed: (Assume that the universe is made up of 4 dimensions for this theory) (Length-x, Width-y, Height-z, Time-t) I think it makes sense that the universe is constantly moving through the time dimension at the speed of light. The reason that time passes slower, when traveling at high speeds, is that the act of traveling at the high speed skews the direction one travels. Take for example a space craft that is stationary. That is to say that it is not moving in the x, y, and z, dimensions. This means according to my theory it is moving at the speed of light in the t (time) dimension. Now suppose it begins moving at 3c/5 (three-fifths the speed of light). According to the law of the conservation of momentum, it must still be moving at c (speed of light). So if the magnitude of the space crafts speed is still c but its moving at 3c/5 in the x dimension, and 0 in the y and z dimensions, there must be a t component of its motion that causes the sum of the x and t vector components to equal c. Therefore Pythagorean Theorem can be used. x^2+t^2=c^2 Where x is the speed in the x direction, t is the speed in the t direction and c is the resultant speed (speed of light). So substituting 3c/5 for x, we can find that t is 4c/5. According to my theory this means that now the craft is only moving four-fifths the speed of light in the t direction (through time) meaning the space craft only ages at 4/5 the normal aging rate. This theory holds true with the notion that increased speeds will slow aging and also that a max speed is the speed of light. Could someone please tell me if this theory either makes sense or if its already been theorized. Thank You.