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It is here that i am struggling hard. As per my knowledge goes, if we place any mass, anywhere in the universe it will curve the space time around it. As long as the mass is not placed, it is a 2d space and when the mass is placed, it is converted to 3d space. How it is possible?.

I mean, if not clear: "WHAT would be the mathematical/geometrical "possibilities" if universal expansion was to reach the impossible edge of the universe, would it be forced to bend itself by splitting and multiplying volume, rules, wherever, so to "turn around"and reach infinity again?