re: #17 jhrhv

I find it kind of sad that more people will know what Beiber is doing today than are probably aware that scientists believe they found a Giant Dark Matter Bridge Between Galaxy Clusters

Found another article with that overlay, but also with a second photo of the dual-galaxies. Scroll down.
Dark-Matter Thread Revealed

Excerpt:

The cosmic web’s individual strands are difficult to detect not only because dark matter is invisible, but also because it’s so diffuse. The filaments are roughly tube-like in shape, and most are oriented vertically from our perspective, so we look through their short dimension instead of along their length. But the strand connecting Abell 222 and Abell 223 happens to be pointing along our line of sight, so we look straight down the barrel. This orientation puts more material between us and the light sources beyond the clusters, which enhances the lensing effect and makes the dark matter detectable.

So it seems that most of the mass within our universe is along these “filaments”, and that most galaxies (a minor part of the mass, which we can see) tend to be found along these filaments, but especially where they intersect, in a sort of web-like structure, as illustrated in this video:
The Cosmic Web, or: What does the universe look like at a VERY large scale?