Here is a bit more information which is somewhat scientific.  it is intenresting none the less as these types of subtle details may put some puzzle pieces together in regards to understanding these old galaxy formations:

Last year, Dr Sebastiano Cantalupo of ETH Zurich in Switzerland and co-authors announced the discovery of what they thought was a large filament next to UM 287. The feature was brighter than it should have been if indeed it was only a filament. It seemed that there must be something else there.

According to the scientists, their discovery provides the strongest support yet for the so-called cold-flow model of galaxy formation, which holds that in the early Universe, relatively cool gas funneled down from the cosmic web directly into galaxies, fueling rapid star formation.

We hope you enjoy the video on these unusual formations!

thanks to sci-news.com for the great info

thanks to Chris Martin and Cal Tech for the pic