Dwarf Dark Matter Galaxy Hides In Einstein Ring

Everybody knows that galaxies are enormous collections of stars. A single galaxy can contain hundreds of billions of them. But there is a type of galaxy that has no stars. That's right: zero stars. These galaxies are called Dark Galaxies, or Dark Matter Galaxies. And rather than consisting of stars, they consist mostly of Dark Matter. Theory predicts that there should be many of these Dwarf Dark Galaxies in the halo around 'regular' galaxies, but finding them has been difficult. Now, in a new pa...