  Although cosmologists have been trying to determine the value of the Hubble
constant for nearly 65 years, they have only succeeded in limiting the range of
possibilities: most of the current observational determinations place the
Hubble constant between 50 km/s/Mpc and 90 km/s/Mpc. The uncertainty is
unfortunate because this fundamental parameter of cosmology determines both the
distance scale and the time scale, and thereby affects almost all aspects of
cosmology. Here we make the case for a Hubble constant that is even smaller
than the lower bound of the accepted range, arguing on the basis of the great
advantages, all theoretical in nature, of a Hubble constant of around 30
km/s/Mpc. Those advantages are: (1) a comfortable expansion age that avoids the
current age crisis; (2) a cold dark matter power spectrum whose shape is in
good agreement with the observational data and (3) which predicts an abundance
of clusters in close agreement with that of x-ray selected galaxy clusters; (4)
a nonbaryonic to baryonic mass ratio that is in better agreement with recent
determinations based upon cluster x-ray studies. In short, such a value for the
Hubble constant cures almost all the ills of the current theoretical orthodoxy,
a flat Universe comprised predominantly of cold dark matter.
