Filament (astronomy)
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In astronomy, filaments are one of the largest known structures in the Universe, thread-like structures with a typical length of 70 to 150 megaparsec that form the boundaries between large voids in the universe. Filaments consist of galaxies; parts where a large number of galaxies are very close to each other are called superclusters.
External link
Picture of the filamentary network (http://www.the-electric-universe.info/Scripts/filament.html)
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