  Although the current galaxy models yield calculations consistent with much of
the data, many irregularities exist, exceptions have been found to the current
models, the $\Lambda$CDM model apparently fails on galaxy scales, dark matter
remains elusive, the phenomena at the center of galaxies are only beginning to
be addressed, and many observations and empirical relationships are
unexplained. A changing universe model (CUM) is proposed that posits the stuff
of our universe is continually erupting into our universe from sources at the
center of galaxies. In this first test of the CUM, a single equation that
describes the rotation velocity curve of spiral galaxies is derived. The
equation is also used to correlate the measured mass of the theorized, central
supermassive black hole with other galaxy parameters. The equation adds one
parameter for each mature galaxy and one parameter for each particle (atom
nucleus and smaller) species to Newtonian dynamics. Rising, flat, and declining
rotation velocity curves are explained without unknown dark matter. Ten
previously unknown parametric relationships are discovered. Also, the CUM
integrates several heretofore unrelated observations. The CUM model is in an
early development stage and has already predicted new relationships among
galaxy parameters.
