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Published online by Cambridge University Press: 04 August 2017
In the past few years the large scale structure and dynamics of the galaxy distributions have been studied intensively, mainly by means of red-shift surveys. From these surveys it seems that the distribution of galaxies is characterised by large, empty voids of (20–40) h−1100 Mpc in diameter with a typical density contrast of δ ∼ - (0.7–0.8).