Scientists now suspect that the tiny, point-like glimmers are actually signals from galactic nuclei outshining their host galaxies. Quasars live only in galaxies with supermassive black holes — black holes that contain billions of times the mass of the sun. Although light cannot escape from the black hole itself, some signals can break free around its edges. While some dust and gas fall into the black hole , other particles are accelerated away from it at near the speed of light . The particles stream away from the black hole in jets above and below it, transported by one of the most powerful particle accelerators in the universe.