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[×ÊÔ´] Nature-20130103

Nature-20130103

About the cover
Giant spiral galaxies are assembled from smaller systems through a process known as hierarchical clustering. In orbit around these giants are dwarf galaxies, which are presumably remnants of the galactic progenitors. Recent studies of the dwarf galaxies of the Milky Way have lead some astronomers to suspect that their orbits are not randomly distributed. This suspicion, which challenges current theories of galaxy formation, is now bolstered by the discovery of a plane of dwarf galaxies corotating as a coherent pancake-like structure around the Andromeda galaxy, the Milky Way¡¯s close neighbour and in many respects its ¡®twin¡¯. The structure is extremely thin yet contains about half of the dwarf galaxies in the Andromeda system. The authors report that 13 of the 15 satellites in the plane share the same sense of rotation. On the cover, a true colour image of the Andromeda galaxy, with two satellite galaxies visible, by Jean-Charles Cuillandre (CFHT) and Giovanni Anselmi (Coelum Astronomia).
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