Mapping the Universe

@article{Geller1989MappingTU,
  title={Mapping the Universe},
  author={Margaret J. Geller and John Peter Huchra},
  journal={Science},
  year={1989},
  volume={246},
  pages={897 - 903}
}
Maps of the galaxy distribution in the nearby universe reveal large coherent structures. The extent of the largest features is limited only by the size of the survey. Voids with a density typically 20 percent of the mean and with diameters of 5000 km s-1 are present in every survey large enough to contain them. Many galaxies lie in thin sheet-like structures. The largest sheet detected so far is the "Great Wall" with a minimum extent of 60 h-1 Mpc x 170 h-1 Mpc, where h is the Hubble constant… 

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