Eight billion years in transit. Telescopes capture a flare from a record-distant galaxy powered by a black hole
Radiation that travelled through space for longer than the Sun and Earth have existed has now been captured by the LST-1 and MAGIC telescopes in the Canary Islands. It was emitted by the active galactic nucleus OP 313, powered by a massive black hole. No one has yet observed a more distant active galactic nucleus in the ultra-high-energy range.