The equations for negative spatial curvature were given by Friedmann in 1924.
2.
Two, is zero spatial curvature _ a so-called flat universe.
3.
Three is negative _ " saddle-shaped " spatial curvature.
4.
One, is positive spatial curvature _ that the universe is like a huge sphere.
5.
The universe seems " low density " and therefore of negative spatial curvature.
6.
It is incompatible with observations that definitely rule out such a large negative spatial curvature.
7.
Thus, Flamm's paraboloid is useful for visualizing the spatial curvature of the Schwarzschild metric.
8.
Since it features both zero energy density and maximally negative spatial curvature, the Milne model is contradicted by flatness.
9.
These and other astronomical measurements constrain the spatial curvature to be very close to zero, although they do not constrain its sign.
10.
Hubble believed that his count data gave a more reasonable result concerning spatial curvature if the redshift correction was made assuming no recession.
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