*Some
Relevant Constants*

G (the universal gravitational constant) = 6.673^{-11}
X 10 nt-m^{2}/kg^{2}.

r_{S} (the Schwartzchild radius, in kilometers)
= GM/c^{2} kilometers, where M is the mass, in kilograms, of the
object whose Schwartzchild radius we're seeking = 1.4835 X M (kgs.) X 10^{-30}
kilometers.

For the sun, r_{S} = 2.95 kms., and M = 1.9885 X 10^{30}
kgs.

c, the speed of light, = 299,792,458 meters/second
= 2.998 X 10 kms./sec.

c^{2} = 8.996 X 10^{16} kms./sec.

The radius of the universe is variously sized as 12,000,000,000 to 14,000,000,000
light-years.

A light-year = 31,536,000 seconds X 299,792,458 meters/second
= 9.4545 X 10^{15} meters = 9.4545 X 10^{12} kilometers.

12,000,000,000 light-years = 1.2 X 10^{10}
light-years = 1.2 X 10^{10} X 0.94545 X 10^{13} kilometers
= 1.1345 X 10^{23} kilometers.

Taking 1.1345 X 10^{23} kilometers to be the Schwartzchild radius
of the universe, its mass becomes

1.1345 X 10^{23} /1.4835 X 10^{-30}
= 7.64 X 10^{52} kilograms, or about 382 X 10^{20} solar
masses.