# Radius of curvature

From Conservapedia

**The radius of curvature** in our universe might be:

*positive*; a positive curvature implies closed space, a universe with a definite, finite volume but with no boundary.*negative*; a negative curvature implies open space, an infinite universe.*zero*; the limiting case of zero curvature is `flat' Euclidean space with an infinite radius.

There are various types of curvature, and, in all but flat space, the amount of curvature has a wide range of possible values.^{[1]}

## References

- ↑ Edwin Hubble (1937). The Observational Approach to Cosmology. Oxford University Press.