Giant Void

The Giant Void (also known as the Giant Void in NGH, Canes Venatici Supervoid, and AR-Lp 36) is an extremely large region of space of underdensity of galaxies within the constellation Canes Venatici. It is the largest confirmed void to date, with an estimated diameter of 300 to 400 Mpc (1 to 1.3 billion light years) and is approximately 1.5 billion light years away (z = 0.116). It was discovered in 1988, and was the largest void in the Northern Galactic Hemisphere, and possibly the largest ever detected. Even the hypothesized "Eridanus Supervoid" corresponding to the location of the WMAP cold spot is dwarfed by this void, although the Giant Void does not correspond any significant cooling to the cosmic microwave background. Although a vast void, inside it are 17 galaxy clusters, concentrated in a spherical shaped region 50 Mpc in diameter. Studies of the motion of the clusters show that they have no interaction to each other, meaning the density of the clusters is very low resulting in weak gravitational interaction. The void's location in the sky is close to the Boötes void. The Boötes void is 5 times nearer but only has ¼ of the size of the Giant Void.