Abstract
Latest estimates of the three cosmological parameters, the density parameter, Hubble constant and the cosmological constant are discussed, in particular with regard to observational constraints on their possible values. These observational constraints include limits on the density of baryonic matter from Big Bang nucleosynthesis, estimates of mass density from the dynamics of galaxies and clusters, estimates from the ages of globular clusters and nuclear cosmochronology, constraints from the cosmic microwave background, results from infra red galaxy data and radio source data, and possible estimates from gravitational lensing. Estimates of the cosmological parameters from radio source data are hampered by the evolution of radio source properties which is not well understood. An investigation of the effect of assuming a non zero cosmological constant on the linear size evolution of radio galaxies is made. It is found that the inclusion of a non zero cosmological constant does not significantly reduce the amount of linear size evolution in the sample used.
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