https://en.wikipedia.org/wiki/KBC_Void https://en.wikipedia.org/wiki/KBC_Void "an immense, comparatively empty region of space...proposed to be roughly spheric

https://en.wikipedia.org/wiki/KBC_Void https://en.wikipedia.org/wiki/KBC_Void "an immense, comparatively empty region of space...proposed to be roughly spherical, approximately 2 billion light-years in diameter. As other voids, it is not completely empty but contains the Milky Way, the Local Group, and a larger part of the Laniakea Supercluster. The Milky Way is within a few hundred million light-years of the void's center." A void has by "working definition" "less than one tenth of the average density of matter abundance that is considered typical for the observable universe." https://en.wikipedia.org/wiki/Void_(astronomy) https://en.wikipedia.org/wiki/Void_(astronomy)