Black holes are mysterious objects, and scientists have a lot to learn about them. So much, in fact, that they didn't think this black hole should even exist.

A black hole with a mass equivalent to 36 billion suns-10,000 times heavier than the one at the center of the Milky Way -has been discovered around 5 billion light-years from Earth. It may be the largest ever identified.

Astronomers have uncovered what may be the most massive black hole ever found, 36 billion times the mass of our Sun, hidden at the heart of the Cosmic Horseshoe galaxy. Located 5 billion light-years away,