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<sub>0</sub> = h à100 km s<sup>âÂÂ1</sup> Mpc<sup>âÂÂ1</sup>). Mpc stands for megaparsec.
The co-ordinates (right ascension and declination) and distance given refer to the approximate center of the region.
In 1985, Tully determined a local dominant supercluster plane, and found the PiscesâÂÂCetus Supercluster Complex.
In a 1985 study of Abell clusters, 29 voids were determined, in the sphere z<0.1 around Earth.
A redshift survey of galaxies in the southern sky in 1988, out to a distance of 120 Mpc/h, revealed some voids.
In 1994, a redshift survey in the southern sky identified 18 voids, 11 of which are major voids.
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).
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.
Analysis of the IRAS redshift survey in 1997 revealed 24 voids, 12 of which were termed "significant"