Astronomy Picture of the Day: Observation challenges established theory of gamma-ray bursts in the universe

The H.E.S.S. observatory in Namibia detected very high-energy light from a gamma-ray burst a billion light-years from Earth. Combined with Fermi and Swift observations, we've got new clues about what powers these incredible cosmic explosions. 💥 More: https://t.co/wj7fyXMEdl pic.twitter.com/gd1BC9zrWl

— NASA Universe (@NASAUniverse) September 15, 2021