List of voids
This is a list of voids in astronomy. Voids are particularly galaxy-poor regions of space between filaments, making up the large-scale structure of the universe. Some voids are known as "supervoids". In the tables, "z" is the cosmological redshift, "c" the speed of light, and "h" the dimensionless Hubble parameter, which has a value of approximately 0.7 (the Hubble constant "H" = "h" × 100 km s Mpc). Mpc stands for megaparsec. The co-ordinates (right ascension and declination) and distance given refer to the approximate center of the region. Voids by search or survey . Tully list. In 1985, Tully determined a local dominant supercluster plane, and found the Pisces-Cetus Supercluster Complex. B&B Abell-derived list. In a 1985 study of Abell clusters, 29 voids were determined, in the sphere z<0.1 around Earth. SSRS1 list. A redshift survey of galaxies in the southern sky in 1988, out to a distance of 120 Mpc/"h", revealed some voids. SSRS2 list. In 1994, a redshift survey in the southern sky identified 18 voids, 11 of which are major voids. 1994 EEDTA Whole Sky Survey. 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). Galactic Anti-Center IRAS search. 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. IRAS list. Analysis of the IRAS redshift survey in 1997 revealed 24 voids, 12 of which were termed "significant"