Great Void

Void (astronomy)

Cosmic voids are vast spaces between filaments, which contain very few or no galaxies. In spite of their size, most galaxies are not located in voids but are gravitationally bound together, creating huge cosmic structures known as galaxy filaments. The cosmological evolution of the void regions differs drastically from the evolution of the universe as a whole: there is a long stage when the curvature term dominates, which prevents the formation of galaxy clusters and massive galaxies. Hence, although even the emptiest regions of voids contain more than ~15% of the average matter density of the universe, the voids look almost empty to an observer.

Boötes Void

The Boötes Void is a roughly spherical region of space in the vicinity of the constellation Boötes. It contains just 60 galaxies, which is significantly fewer than the approximately 2,000 galaxies expected for an area of comparable size. With a radius of 62 megaparsecs, it is one of the largest known voids in the visible universe, and is often referred to as a "supervoid".

great

Adjective

1. Taking up a lot of space; large.

Interjection

1. Expression of gladness and content about something.
2. A sarcastic inversion thereof.

void

Adjective

1. Containing nothing; empty; not occupied or filled.
2. Having no incumbent; unoccupied; said of offices etc.

Noun

1. An empty space; a vacuum.
2. An extended region of space containing no galaxies.