  General relativity is a mathematical model that uses sophisticated geometry
to describe simple physics. It agrees with experiment in the few tests that can
be made, but the whole edifice is not physics. Instead of using observations to
test that model, I derive a simple empirical model of elementary physics and
cosmology from the observations. The observations imply that the universe is a
finite cellular automaton; that there is no curved space; that fundamental
particles are massless; that "massy" particles, including electrons, are
composed of fundamental particles; that gravitational mass is inertial mass;
that black holes are made from neutrons compressed into bosons; that the
universe was produced from cold compressed particles, not radiation; and that
the universe is not expanding.
