Sunday, August 28, 2016

Dragonfly 44: A Large Galaxy of Dark Matter

An ultra-diffuse galaxy (UDG) called Dragonfly 44 was observed by the Keck II telescope, consisting mostly of dark matter.  It is roughly the size of our Milky Way galaxy and certainly not fully described by the standard model of particle physics.  What could such a dark galaxy be made of?  Cast your votes.