[/caption] Astronomers have long suspected that something must stymie actively growing black holes, because most galaxies in the local universe don’t have them. Now, the Gemini Observatory has captured a galactic check-and-balance — a large-scale quasar outflow in the galaxy Markarian 231 that appears to be depriving a supermassive black hole its diet of gas … Continue reading "Halt, Black Hole! Gemini Captures Explosions That Deprive Black Holes of Mass"