Visualising a Boundless universer, no edges, no centre

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And the act of leaving and returning would alter the system. In a relativistic sense, the photon is in another place/time.

"If one could return to the same instance one would have never left in the first place"

I thought that I already had. If one walks around the block and completes 1 revolution, they are neither in the same spatial locus nor the same temporal locus. The only way that I am aware of for a person, particle, quanta or anything else to be in the exact same locus is to have zero momentum. No movement in time or space, not even on the smallest scale. Any action within any system will change the system. When I said that "If one could return to the same instance one would have never left in the first place", I was attempting to simplify very complex ideas. Heisenbergs uncertainty principle is related to this topic, as well as schroedingers theories. We also should not dismiss relativaty.

I never did a decree in astronomy phisics. I think I am out of my depth