  Pathria(1972) has shown, for a pressureless closed Universe, that it is
inside a black (or white) hole. We show now, that the Universe with a cosmic
pressure obeying Einstein's field equations, can be inside a white-hole. In the
closed case, a positive cosmological constant does the job; for the flat and
open cases, the condition we find is not verified for the very early Universe,
but with the growth of the scale-factor, the condition will be certainly
fulfilled for a positive cosmological constant, after some time. We associate
the absolute temperature of the Universe, with the temperature of the
corresponding white-hole.
