Powerful US and European telescopes find evidence of a massive explosion five times bigger than anything observed to date.
Coming from about 390 million light years from earth, the huge release of energy is thought to have emanated from a super massive black hole.
The eruption is thought to have left a huge dent in the Ophiuchus galaxy cluster.
Research Prof Johnston-Hollitt who was involved in the project, explained: "The cavity is about one-and-a-half-million light-years across. So the hole that was punched in the surrounding space in the hot X-ray plasma would take light itself one-and-a-half-million years to traverse."


Belarus frees Nobel winner, protest figures as US lifts more sanctions
Indonesia flood death toll exceeds 1,000
Ukraine's Odesa suffers major blackouts after Russian attack
Two killed in Ukrainian drone strike on Russia's Saratov
Thailand continues Cambodia strikes despite Trump's ceasefire claim