Cosmic voids are vast spaces between filaments, which contain very few or no galaxies. The cosmological evolution of the void regions differs drastically from the evolution of the Universe as a whole. Cosmic voids are vast spaces between filaments (the largest-scale structures in the universe), which contain very few or no galaxies. Astronomers believe that voids are formed by the hierarchical clustering of galaxies around primordial density fluctuations (quantum mechanical fluctuations in the density of the Universe in the very first moments following the Big Bang). Although we live in a cosmic metropolis, back in 1987 Tully and Richard Fisher noted that our Milky Way galaxy is also at the edge of an extensive empty region that they called the Local Void. Radio astronomers have found the biggest hole ever seen in the universe. The void, which is nearly a billion light years across, is empty of both normal matter and dark matter. The finding challenges theories of large-scale structure formation in the universe. With a radius of roughly one billion light years, the void containing our Milky Way, known as the KBC void (for scientists Keenan, Barger, and Cowie), is the largest confirmed void in the Universe. At nearly 330 million light-years in diameter (approximately 0.27% of the diameter of the observable 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 super void. Its discovery was reported by Robert Kirshner.

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