In our time, the theory of the expanding universe observations fully justified. It leads to the most important fundamental conclusions. One of these conclusions is related to the curvature of three-dimensional space. Friedman's theory says that if in the universe a lot of material, so that the average density of all its species exceeds a certain critical value, the curvature of space caused by the gravity of this matter, similar to the curvature of the sphere. The only difference lies in the fact that the two measuring scope, y of - three. But the sphere, curving, closes itself. The area of ??the sphere's surface is finite. Similarly, curved and three-dimensional space is closed on itself. The world is closed.
Guide to Human Anatomy
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