Giant Void


The Giant Void is an extremely large region of space with an underdensity of galaxies and located in the constellation Canes Venatici. It is the second largest confirmed void to date, with an estimated diameter of 300 to 400 Mpc and is approximately 1.5 billion light years away. It was discovered in 1988, and was the largest void in the Northern Galactic Hemisphere, and possibly the second 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.