One Galaxy is Made Almost Entirely of Dark Matter

Most galaxies are full of stars, dust, and gas, but Dragonfly 44 is different—its central region is about 98% dark matter. This faint galaxy, found in the Coma Cluster, has so few stars that it should have been torn apart by gravity long ago. The best explanation? An enormous halo of invisible dark matter, roughly the mass of the Milky Way, is holding it together. Whatever dark matter is, Dragonfly 44 shows it’s not just a small part of the universe—it can dominate entire galaxies.