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The universe might have something like 10^22 to 10^24 (give or
take a few factors of ten) star's worth of mass. If 10^24 solar
masses were to coalesce into a black hole (or simply already and
for all time have been a black hole), R would be billions of light
years (i.e., something like the size of the universe) and g would
be 15 pm/s^2 (i.e., completely negliglbe) at the "event horizon."
Interesting?