Astronomers have used NASA's Chandra X-ray Observatory and a suite of other telescopes to reveal one of the most powerful black holes known, in a galaxy cluster located about 3.9 billion light years from Earth. The black hole has created enormous structures in the hot gas surrounding it and has prevented trillions of stars from forming. It is believed that this black hole may be "ultramassive" in size rather than simply supermassive, with a mass more than 10 billion times that of the sun.