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The Giant Void (also known as the Giant Void in NGH, Canes Venatici Supervoid, and AR-Lp 36) is an extremely huge 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)〔 Kopylov A. I.; Kopylova, F. G." (2002) ("Search for streaming motion of galaxy clusters around the Giant Void" ) (PDF) ''Astronomy and Astrophysics'', v.382, p.389-396 〕 and is approximately 1.5 billion light years away (z = 0.116).〔 It was discovered in 1988,〔"The Northern Cone of Metagalaxy" (Kopylov et al. 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. ==See also== * Local Void * Northern Local Supervoid * Southern Local Supervoid * Microscopium Void * Large-scale structure of the cosmos * Void (astronomy) 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Giant Void」の詳細全文を読む スポンサード リンク
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