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. Mpc stands for megaparsec.
The co-ordinates and distance given refer to the approximate center of the region.

Voids and supervoids

Designation	Location	Coordinates	Distance	Diameter	Dimensions	Notes
Bahcall & Soneira 1982 void	z = 0.03 – 0.08				150 Mpc deep 300 Mpc wide 60 Mpc tall	This suspected void ranged 100 degrees across the sky, and has shown up on other surveys as several separate voids.

In 1985, Tully determined a local dominant supercluster plane, and found the Pisces–Cetus 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.

#	Coordinates	Distance	Dimensions W × H × D	Constellation	Notes
1		3000 km/s	30 × 30 × 40	Phoenix/Eridanus	Located just behind the galaxy concentration in Eridanus-Fornax-Dorado
2		5000 km/s	30 × 30 × 30	Capricornus/Microscopium
3		6000 km/s	70 × 30 × 50	Sculptor/Grus
4		9000 km/s	50 × 100 × 50	Horologium/Eridanus

In 1994, a redshift survey in the southern sky identified 18 voids, 11 of which are major voids.

#	Coordinates	Distance	Diameter	Constellation	Notes
1		85.7	54.3	Cetus	major void
2		99.7	56.2	Fornax	major void SRSS1 Void 4
3		107.2	60.8	Aquarius	major void
4		66.7	35.6	Capricornus	major void
5		53.0	34.8	Aquarius/Sculptor	major void SRSS1 Void 3
6		56.5	32.0	Eridanus	major void
7		77.2	25.5	Eridanus	major void
8		83.9	27.8	Aquarius	major void
9		114.6	39.0	Eridanus	major void
10		104.7	34.8	Cetus	major void
11		112.8	42.9	Sculptor	major void
12		74.8	25.0	Piscis Austrinus/Sculptor
13		31.0	22.1	Cetus	SRSS1 Void 1
14		87.2	21.3	Piscis Austrinus/Microscopium
15		116.1	27.3	Microscopium
16		36.5	20.3	Capricornus
17		32.1	19.0	Eridanus
18		85.9	21.1	Eridanus

A 1994 census lists a total of 27 supervoids within a cube of 740 Mpc a side, centered on us.

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.

#	Coordinates	Distance	Dimensions	Notes
V0		1000	96°×36°×2000 km/s
V1		3750	15°×36°×3500 km/s	V1 and V2 are connected, and block the Perseus–Pisces Supercluster from traversing the Zone of Avoidance.
V2		8000	25°×14°×2000 km/s	V1 and V2 are connected, and block the Perseus–Pisces Supercluster from traversing the Zone of Avoidance.
V3		7000	30°×20°×2000 km/s	This void lies in front of the CfA2 Great Wall.

Analysis of the IRAS redshift survey in 1997 revealed 24 voids, 12 of which were termed "significant"