The Heavyweight Champion of the Universe

About 3.4 billion light-years away, in the general direction of the constellation Draco, lies one of the heaviest singular objects in the known universe. Designated H1821+643, it has roughly 30 billion times the mass of the sun, with an event horizon that could swallow our solar system--28 times over.There's been a bit of buzz lately about the smallest supermassive black hole ever discovered. While the "supermassive oxymoron" has some interesting implications for how we think about the evolutio...