Did you know:
In the constellation of Eridanus, There is a region of space, 1 billion light-years in diameter that is completely devoid of all stars and galaxies.
… now you do!
There are many interesting theories concerning the Eridanus supervoid, which is the largest supervoid that has been discovered thus far. One of my favorites suggest that the void is a ‘universe-in-mass’ black hole.
Here is an interesting (albeit wacky) read on the subject:
“Is the Eridanus Void a “Universe-in-Mass” Black Hole One-Billion Light Years Across?”