Yep it's pretty big as holes go.

QuoteAstronomers have discovered what they say is the largest known structure in the universe: an incredibly big hole.

The "supervoid", as it is known, is a spherical blob 1.8 billion light years across that is distinguished by its unusual emptiness.

István Szapudi, who led the work at the University of Hawaii at Manoa, described the object as possibly "the largest individual structure ever identified by humanity".

http://www.theguardian.com/science/2015/apr/20/astronomers-discover-largest-known-structure-in-the-universe-is-a-big-hole

Interesting find Freddy, actually Light leaving the cold spot and having a longer wave length, not sure if I'm ready to think about this.
Carl2