Dwarf galaxies that orbit big galaxies

At http://www.dailygalaxy.com/my_weblog/2014/07/dwarf-galaxies-challenge-ou… … which stems from the discovery of dwarf galaxies surrounding the Andromeda Galaxy, orbiting it in an immense plane. Everywhere astronomers looked they saw a coherent and co-ordinated system of dwarf galaxies rotating around Andromeda. Afterwards, they looked at other galaxies and found the same thing – observable in 50 per cent of them. The very fact that dwarf galaxies are in harmony with neighbouring big galaxies seems to defy current cosmological consensus.