Astronomers have discovered what they believe to be the largest explosion ever detected.
The explosion is more than 10 times brighter than any recorded supernova. So far it has lasted more than three years, much longer than most supernovae which are usually only visibly bright for a few months.
One theory is that the blast was caused when a vast cloud of gas was swallowed up by a black hole.
A flash in the sky was first automatically detected and recorded in 2020 by the Zwicky Transient Facility in California. But it wasn't until a year later that it was picked up by astronomers combing through the data.
Read more on this excellent popular science story about the event at BBC Science, written by Pallab Ghosh, or check out the owen-fresh scientific article in Monthly Notices of the British Astronomical Society or look at the astronomer's original report of the observation.