Boötes Void

The Boötes Void, nicknamed the Great Nothing, is a roughly spherical region of space near the constellation Boötes. It holds only about 60 galaxies where some 2,000 would be expected, and with a radius of 62 megaparsecs (nearly 200 million light-years) it is one of the largest known voids, often called a supervoid.

Robert Kirshner discovered it in 1981 during a galaxy redshift survey. Its centre is about 700 million light-years away, and it may have formed by smaller voids merging.