Page:Relativity (1931).djvu/157

necessarily finite. In fact, the theory supplies us with a simple connection^[1] between the space-expanse of the universe and the average density of matter in it.

1. For the “radius” $R$ of the universe we obtain the equation

   $R^{2}={\frac {2}{\kappa \rho }}$

   The use of the C.G.S. system in this equation gives ${\tfrac {2}{\kappa }}=1\cdot 08.10^{27}$; $\rho$ is the average density of the matter.