As we see in the drawing, when rotating gravitational systems on themselves, their gravity lines take spiral form and go bending and roll some on other (although conserving their longitude) and reducing this way the initial volume occupied by the system.
In fact, it seems that it is the space-time (component of the gravity lines) that contracts in its entirety, question already proposed by this cosmic theory when accepting the union of space-time points (energy) to form others of bigger dimension.
At the same time we see that to "bigger density of gravity - bigger bending in spiral" of the gravity lines and therefore taking these lines of gravity more and more tangential direction on the central nucleus. For this reason we can accept that in the big systems this tangential direction facilitates the turn of the orbital ones in near areas to the nucleus where otherwise they would be attracted and absorbed by this nucleus.
In the inferior drawings you can see the tangential direction of gravity in the big systems.
On the other hand, the turn direction around the nucleous of the orbital ones (planets and electrons) is determined by this gravity tangential direction.
