Geometry of Universe
It is a normal question arises among the scientists that the shape or size of universe is infinite or not. If infinite then what exists outside in our universe. Curvature of universe can give a possible idea that should be flat curvature, positive curvature and negative curvature as well as the topology of the universe in terms of what it shaped and how it is connected. There possible three shape of Universe. Spherical universe, Flat universe and hyperbolic universe. Read more in https://sciepoli.blogspot.com/2019/09/geometry-of-universe.html