Cosmic Structure
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
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