It is known that space is warped by its mass/energy. If the mass/energy is sufficiently dense space will curve back on itself. If the mass/energy is sufficiently smooth it will curve back on itself evenly. In the model generally under discussion it is assumed ” assumed in the model; not in the Universe ” that the density and smoothness are sufficient. A closed, smooth, even 3-D curve is called the surface of a hyper sphere.
By way of analogy I used a closed, smooth, even 2-D curve called the surface of a sphere because it is easier to grasp. As has been mentioned, the parts of a model that are not being explained need not be incorporated into the analogy.
The fluffy, little cloud out side my office window is made of trillions of teeny-tiny, nearly perfect spheres. Thanks to you I now know it’s man made. Must be nice men who made that nice cloud.
Kindly
There is a spider by the water pipe.
™ Version 4.2
