Astronomers capture largest cosmic explosion ever witnessed

Astronomers have observed the most energetic explosion ever: a fireball 100 times the size of the Solar System and 2 trillion times brighter than the Sun, which has existed for 3 years. The event, dubbed AT2021lwx, might have been caused by an enormous star or cloud of gas being gobbled up by a black hole. The reason why night hasn’t been turned to day here on Earth is that the party is happening 2.5 billion parsecs away. It’s not the brightest event ever seen — that would be the γ-ray burst known as GRB 221009A — but that lasted only a few minutes.