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If you have two bodies in space, one in motion and one stationary, other than observing measurements of time dilation, there is no way to definitively define which body is in motion and which body is stationary. [?] The only thing that can be stated on the motion of the bodies with any certainty; the bodies are moving relative to each other. Which body is moving with what velocity is impossible to define outside of measuring time dilation.
This solution becomes apparent when you think about this difficulty in this manner: Picture yourself outside the universe observing the rotation of the universes orbit around the black holes at the center of our universe.
Without a third reference body (the inertia phenomenon) it is impossible to know (without measuring time dilation) if the universe is rotating or not.
It could be that you are orbiting around the universe. Outside of measuring time dilation, there is no meaning in velocity in space without a third reference body in which all relative motion is referenced proprietary to the inertia phenomenon. As already mentioned, time dilation could not exist without the reference body of the inertia phenomena, which means there must be a reference body for the inertia phenomena. The only motion that can be definitively defined without defining the reference body of the inertia phenomena or measuring time dilation, is the expansion of the universe.
There is no need for a third reference body to define the expansion of the universe because you only need two bodies to define expansion in space. As meaningless as this fact first appears, it is fundamental in defining the reference body of the inertia phenomena. If we were to use a supercomputer to create a virtual reproduction of our universe, we would need to define the reference body of the inertia phenomena for our virtual universe. The previous deduction defining the only definitive motion in space as expansion or contraction because only two bodies are required to define these motions are fundamental clues on how we should go about setting up our virtual universe so that it has the same properties as the actual universe as we experience it. Using this fundamental clue you will come to the conclusion that a universal spatial expansion of space time and matter would work as the third reference (inertia) of all other motion in space. The problem with this assumption is the fact that the universal spatial expansion of all space-time and matter would be meaningless (could not exist) without a reference body for this expansion.