Page:Eddington A. Space Time and Gravitation. 1920.djvu/195

of the gravitational to the electrical radius, 3.10⁴², ought to be of the same order as the ratio of the latter to the radius of curvature of the world. This would require the radius of space to be of the order 6.10²⁹ cms., or 2.10¹¹ parsecs., which though somewhat larger than the provisional estimates made by de Sitter, is within the realm of possibility.