Both the Milky Way and Andromeda galaxies are associated with dwarf satellite galaxies apparently co-rotating in the same plane. This paper suggests that this arrangement may be ubiquitous. Rodrigo Ibata and colleagues measured the velocities of pairs of diametrically opposed galaxy satellites in the local Universe and found them to be preferentially anti-correlated out to 150 kiloparsecs from their hosts. In the larger-scale environment, galaxies are distributed mainly in clumps along the axis joining the inner satellite pair.
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