How big can galaxies and black holes get?
Given what we know about our universe, what is the most massive possible observable galaxy at a given time?
From Large to Small: Astrophysical Signs of Dark Matter Particle Interactions
The dark matter halos of galaxies and clusters of galaxies—objects of literally astronomical dimensions—have lots to say about the mysterious, likely subatomic, dark matter particle.
Finding the source of the Universe’s infrared glow
New observations at infrared background find a mysterious background glow on the sky, which is inconsistent with the previously proposed models for its origin. The authors suggest that the infrared glow could be coming from rogue stars that have been expelled from host galaxies out into the dark matter halos that surround galaxies.