  From the axiom of the unrestricted repeatability of all experiments, Bondi
and Gold argued that the universe is in a stable, self-perpetuating equilibrium
state. This concept generalizes the usual cosmological principle to the perfect
cosmological principle in which the universe looks the same from any location
at any time. Consequently, I hypothesize that the universe is static and in an
equilibrium state (non-evolving).
  New physics is proposed based on the concept that the universe is a pure wave
system. Based on the new physics and assuming a static universe, processes are
derived for the Hubble redshift and the cosmic background radiation field.
  Then, following the scientific method, I test deductions of the static
universe hypothesis using precise observational data primarily from the Hubble
Space Telescope. Applying four different global tests of the space-time metric,
I find that the observational data consistently fits the static universe model.
The observational data also show that the average absolute magnitudes and
physical radii of first-rank elliptical galaxies have not changed over the last
5 to 15 billion years.
  Because the static universe hypothesis is a logical deduction from the
perfect cosmological principle and the hypothesis is confirmed by the
observational data, I conclude that the universe is static and in an
equilibrium state.
