In summary: Obviously the confusion is caused by my poor knowledge of the English language: I wanted to ask about two aspects:- the greatest possible positive curvature of the universe;- the radius of the 3-sphere to which this curvature corresponds.The first is impossible to determine, as the curvature parameter is currently unknown. However, if we assume that the curvature is positive, then the radius of the corresponding 3-sphere would be 265 Gly.The second is also impossible to determine, as the radius of the 3-sphere is currently unknown. However, if we assume that the radius is 265 Gly, then the current unobservable universe should be at least ~3.3 trillion light