Read this article today, this is something we literally just discovered. Who knows if it will stay discovered, but heck it's cool none the less.
We have discovered what is likely dark matter filaments holding two galaxies together.
http://www.space.com/16412-dark-matter-filament-galaxy-clusters.html
We have discovered what is likely dark matter filaments holding two galaxies together.
http://www.space.com/16412-dark-matter-filament-galaxy-clusters.html