Observations of the light curve widths and peak flux densities of type Ia supernovae are traditional measurements for investigating cosmology. It is shown that a static, tired light, cosmology theory predicts the same redshift dependence of width$\propto (1+z)$, as an expanding cosmology. A completely new analysis of 1,413 type Ia supernovae and 653,338 quasar magnitudes is used to investigate whether a static cosmology is viable.

The aim is to show that the observations are consistent with a simple model of type Ia supernovae and then to use the measurements of their light curve widths and magnitudes to compare a static cosmology with an expanding cosmology.} {The light curve widths of the type Ia supernovae are determined by the direct fit of the observed flux densities as a function of epoch to a standard template. This provides width and peak magnitude estimates for each supernova. Number density and magnitudes of quasars as a function of redshift provide additional data.

It is shown that the regression equation for the observed widths is $w=(1.043\pm0.006)+(0.948\pm0.027)z$. The regression of peak absolute magnitude as a function of redshift is $M(z) = -(19.088\pm0.012)-(0.124\pm 0.107)z$. Both regressions are consistent with both cosmologies. The number density and magnitudes of quasars provides additional evidence for a static universe.

Although an expanding universe could be valid, there is strong evidence that the universe is static.