Voids are particularly galaxy-poor regions of space between filaments, making up the large-scale structure of the universe.
The co-ordinates (right ascension and declination) and distance given refer to the approximate center of the region.
[23] A redshift survey of galaxies in the southern sky in 1988, out to a distance of 120 Mpc/h, revealed some voids.
[19] A 1994 census lists a total of 27 supervoids within a cube of 740 Mpc a side, centered on us (z=0.1 distant sphere).
[25] In a 1995 study of IRAS data looking for large-scale structure in the Galactic Anticenter in the Zone of Avoidance, four voids were discovered.