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 Filament (astronomy) - Definition 

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.

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See also

Picture of the filamentary network (http://csep10.phys.utk.edu/astr162/lect/cosmology/growth.html)

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