Local supercluster and anomalous Hubble expansion

The local supercluster of galaxies (LSG) is considered as an expanding region inside a vacuole which is itself embedded in a Friedmann model. It is shown that de Vaucouleurs' data for the LSG can be accounted for by this inhomogeneous cosmological model. On the contrary, the interpretation of these observations would meet some difficulty with a theory of tired light.Dedicated to Achille Papapetrou on the occasion of his retirement.