I hesitate to offer my humble advice to such eminent astronomers, but when I discover a complete void when looking through my telescope, I usually check to see if I've left the lens cap on. That usually does the trick.
Astronomers are scratching their heads over a puzzling non-discovery, an enormous hole in the universe measuring nearly a billion light-years across.
There really is nothing to the void, which is empty of both normal matter such as stars, galaxies, and gas, and the mysterious, unseen "dark matter" that astronomers detect by its gravitational pull.
Cambridge Hall, Kilburn: A cathedral among tin tabernacles
17 minutes ago