Discovery of a Dark Matter Galaxy

Last week, astronomers announced the discovery of a galaxy that is almost entirely comprised of dark matter. At first glance, the galaxy, Dragonfly 44, is roughly the same size as the Milky Way, but only contains 1 percent as many stars. Naively, one would expect this galaxy to be torn apart by its surroundings in the Coma Cluster. However, Dragonfly 44 is composed of 99.99% … Continue reading Discovery of a Dark Matter Galaxy