The humongous black hole in the center of a galaxy called NGC 1600 took the MASSIVE Survey astronomers by surprise. It's not only almost as big as the largest one we've discovered, it's also located in a sparsely populated region of only 20 or so galaxies, 200 million light years away. To note, it's 17 billion times bigger than our sun, while the largest one that we know of is 21 billion times larger. Supermassive black holes, which weigh at least 10 billion suns, are typically found in the center of huge galaxies that reside in heavily populated areas. NASA says finding NGC 1600's was like finding a skyscraper in the middle of a small town.