An enormous sheet-like structure of galaxies that can extend for hundreds of millions of light-years, representing one of the largest known structures in the universe. These walls form the boundaries of cosmic voids and are composed of connected galaxy filaments.
Named by analogy to the Great Wall of China due to its vast, wall-like appearance when mapped in three dimensions. The first 'Great Wall' of galaxies was discovered in 1989 by Margaret Geller and John Huchra, revolutionizing our understanding of cosmic structure.
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