Voids are a large region outside the filaments, the largest-scale structures in the Universe that contain very few, or no, galaxies. Voids typically have a diameter of 11 to 150 Mpc; particularly large voids, defined by the absence of rich superclusters, are sometimes called supervoids.
A 1994 census ("The structure of the Universe traced by rich clusters of galaxies.") lists a total of 27 supervoids with a distance of up to 740 Mpc; a selection is given below:
|#||Name||Distance (Mpc)||Diameter (Mpc)|
|9||Southern Local Supervoid||135||158|
|24||Northern Local Supervoid||86||146|
- U. Lindner, J. Einasto, M. Einasto, W. Freudling, K. Fricke, E. Tago: The structure of supervoids. I. Void hierarchy in the Northern Local Supervoid., Astron. Astrophys., v.301, p.329 (1995)
- M. Einasto, J. Einasto, E. Tago, G. B. Dalton, H Andernach: The structure of the Universe traced by rich clusters of galaxies., Mon. Not. R. Astron. Soc. 269, 301 (1994)