"Dark dwarfs" may sound like a new race of Sauron-worshipping Middle-Earth dwellers, but it's actually a new type of stellar body proposed to exist at the hearts of galaxies.
The prefix "dark" here doesn't refer to the Dark Lord, but rather to dark matter, the mysterious stuff that accounts for 85% of the matter in the universe. This form of matter remains effectively invisible because it doesn't interact with light, but it does interact with gravity.
