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 
, where c is speed of light, G is Newtonian gravitational constant, and ρ is density of space of this universe. The numerical value of Einstein's radius is of order of 1010 light years.