Sometimes incredibly extended jets rise outwards from the central black hole. These jets eject particles at nearly the speed of light. But there are even more mysteries out there. About twice a day satellites in orbit register a burst of gamma-rays somewhere in the Universe. These bursts may last a hundredth of a second, or anything up to 90 minutes.
Some bursts become briefly the brightest objects in the gamma-ray sky.
The observations at different wavelengths confirmed that the gamma-ray bursts are extremely distant and therefore must be caused by tremendous explosions. On 23 January 1999 there was another exciting event. They discovered that this burst was the most energetic eruption ever recorded, equal to the radiance of one million galaxies or 100 million billion stars. Astronomers don't have an answer yet. Maybe gamma-ray bursts are created by the mergers of a pair of neutron stars or black holes, or by a hypernova, a theorized type of exceptionally violent exploding star.