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So that you are aware ; all processes in the world (and their material) appear in the space-time structure . Therefore ; gravitational forces between materials are repulsive temporal , attractive spatial . If there are no temporal forces felt and materials ; this is because that the processes are happened synchronically without time distances and usually the average temporal thicknesses of materials are approximately equal .
In the other hand ; the Universal expansion occurs by repulsive force of the dark energy . So it seems that this repulsive force is the same temporal component of Universal gravitation .
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