In cosmology, galaxy filaments (subtypes: supercluster complexes, galaxy walls, and galaxy sheets)[1][2] are the largest known structures in the universe, consisting of walls of gravitationally bound galaxy superclusters. These massive, thread-like formations can reach 80 megaparsecs h−1 (or of the order of 160 to 260 million light-years[3][4]) and form the boundaries between large voids.[5]
https://en.wikipedia.org/wiki/Galaxy_filament
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