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Published online by Cambridge University Press: 19 July 2016
The evidence for the existence of very large scale structures, ∼ 100h −1Mpc in size, as derived from the spatial distribution of clusters of galaxies is summarized. Detection of a ∼ 2000 kms −1 elongation in the redshift direction in the distribution of the clusters is also described. Possible causes of the effect are peculiar velocities of clusters on scales of 10–100h −1Mpc and geometrical elongation of superclusters. If the effect is entirely due to the peculiar velocities of clusters, then superclusters have masses of order 1016.5M ⊙ and may contain a larger amount of dark matter than previously anticipated.