UK astronomers discover one of the biggest ultramassive black holes ever detected.

UK astronomers have discovered an ultramassive black hole, about 30 billion times the mass of the Sun, using gravitational lensing. The black hole is one of the largest ever detected and on the upper limit of how large black holes can theoretically become. Ultramassive black holes are rare and elusive, and their origins are unclear. The researchers said their work opened up the possibility of discovering more ultramassive black holes than previously thought.