Einstein's radius of the universe
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For other topics related to Einstein see Einstein (disambig)
Einstein's radius of the universe is radius of curvature of space of Einstein's universe, a model universe that was supposed to represent our universe in idealized form. The radius of curvature of space of this universe (Einstein's radius) is <math>R_E=c/\sqrt {4\pi G\rho}<math>, where <math>c<math> is speed of light, <math>G<math> is Newtonian gravitational constant, and <math>\rho<math> is density of space of this universe. The numerical value of Einstein's radius is of order of <math>10^{10}<math> light years.