Andromeda’s satellites behave as expected… if they are tidal dwarf galaxies

The January 3rd issue of Nature contains a very exciting study by Rodrigo Ibata et al. which might be a game-changer in the research areas of galaxy formation and near-field cosmology. It is titled 'A vast, thin plane of corotating dwarf galaxies orbiting the Andromeda galaxy' and already now should be seen as a candidate for the most-exciting paper of 2013.