Breiseáin

My God! It's full of stars. Galaxy filaments, also called supercluster complexes or great walls, are, so far, the largest known cosmic structures in the universe, thread-like structures with a typical length of 50 to 80 megaparsecs h-1 that form the boundaries between large voids in the universe.[3] Filaments consist of gravitationally-bound galaxies; parts where a large number of galaxies are very close to each other are called superclusters.
http://en.wikipedia.org/wiki/Galaxy_filament