Biggest cosmic explosion ever detected left huge dent in space

Eruption in black hole 390m light years away punched cavity the size of 15 Milky Ways

The biggest cosmic explosion on record has been detected - an event so powerful that it punched a dent the size of 15 Milky Ways in the surrounding space.

The eruption is thought to have originated at a supermassive black hole in the Ophiuchus galaxy cluster, which is about 390m light years from Earth.