The Boötes void or the Great Void is a huge and approximately spherically shaped region of space, containing very few galaxies. According to astronomer Greg Aldering, the scale of the void is such that “If the Milky Way had been in the center of the Boötes void, we wouldn’t have known there were other galaxies until the 1960s.
“It is located in the vicinity of the constellation Boötes, hence its name. Its center is located at approximately right ascension 14h 20m and declination 26° Coordinates: 14h 20m 0s, +26° 0′ 0″
At nearly 250 million light-years in diameter (approximately 0.27% of the diameter of the visible universe), or nearly 236,000 Mpc3 in volume, the Boötes void is one of the largest known voids in the universe, and is referred to as a supervoid. Its discovery was reported in Robert Kirshner et al. (1981), as part of a survey of galactic redshifts. The center of the Boötes void is approximately 700 million light years from Earth.
Other astronomers soon discovered that the void contained a few galaxies. In 1987, J. Moody, Robert Kirshner, G. MacAlpine, and S. Gregory published their findings of eight galaxies in the void. M. Strauss and John Huchra announced the discovery of a further three galaxies in 1988, and Greg Aldering, G. Bothun, Robert P. Kirshner, and Ron Marzke announced the discovery of fifteen galaxies in 1989. By 1997, the Boötes void was known to contain 60 galaxies. Via Boötes void
