I am truly so fascinated by the science of black holes. Black holes are one of my favorite phenomenons that occur in our universe. But over the last decade or so we have been stuck on the idea that black holes only come in two sizes; from stellar mass black holes that are only 12 or so times the mass of our sun, to supermassive black holes that reach millions of times that size. But, yes there is a but, we have found medium sized black holes (once thought to not exist) that are only 50oo times more dense than the sun. That is so freaking awesome, like wow, all i have to say.