'Ultramassive' black hole discovered by Durham astronomers

Astronomers say they have found one of the universe's largest black holes to date using a new technique. Scientists at Durham University discovered the "ultramassive" black hole by observing its pull on passing light, called gravitational lensing. Dr James Nightingale who led the study said even he struggled to "comprehend how big this thing is". Their findings have been published in the journal Monthly Notices of the Royal Astronomical Society.