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It was found that satellites of nearby galaxies can form flattenedco-rotating structures called disks of satellites or planes of satellites.Their existence is not expected by the current galaxy formation simulations inthe standard dark-matter-based cosmology. On the contrary, modified gravityoffers a promising alternative: the objects in the disks of satellites aretidal dwarf galaxies, that is small galaxies that form from tidal tails ofinteracting galaxies. After introducing the topic, we review here our work onsimulating the formation of the disks of satellites of the Milky Way andAndromeda galaxies. The initial conditions of the simulation were tuned toreproduce the observed positions, velocities and disk orientations of thegalaxies. The simulation showed that the galaxies had a close flyby 6.8Gyr ago.One of the tidal tails produced by the Milky Way was captured by Andromeda. Itformed a cloud of particles resembling the disk of satellites at Andromeda byits size, orientation, rotation and mass. A hint of a disk of satellites wasformed at the Milky Way too. In addition, the encounter induced a warp in thedisk of the simulated Milky Way that resembles the real warp by its magnitudeand orientation. We present here, for the first time, the proper motions of themembers of the disk of satellites of Andromeda predicted by our simulation.Finally, we point out some of the remaining open questions which thishypothesis for the formation of disks of satellites brings up.

Are disks of satellites comprised of tidal dwarf galaxies?