Einstein's radius of the universe
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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 1010 light years.