Of course, it’s a cold black hole, a large one at 1.8-billion light years across, and about 3-billion light years from earth. Joseph Stromberg:
The mystery is a “cold spot,” a gigantic void that has surprisingly few galaxies present. At 1.8 billion light years across, it’s the largest structure we’ve ever discovered…
This didn’t fit with our models for how the universe formed, since they predict that it should be relatively homogenous everywhere. The most obvious explanation was that the cold spot was simply an unexpected void — an area with relatively few galaxies — but when scientists mapped extremely distant areas of the universe in the direction of the cold spot in 2009, they didn’t find any voids. Some scientists suggested the cold spot was the result of errors made by analyzing the CMB data, and others even controversially claimed it might be evidence of a parallel universe.
A parallel universe? Could I meet my doppelgänger?