Zhen Yan

At the centers of many galaxies lurk supermassive black holes. From time to time they 'scream' — unleashing powerful X-ray flares. Scientists have long puzzled over the nature of these 'quasi-periodic eruptions'.

The black hole in GRS 1915+105 behaves like a lighthouse with a shaky foundation: its jet, normally aimed in one direction, suddenly veered off by 34 degrees in just a month. Astronomers spotted this during a radio burst in 2025. It turns out that since 2023, the "beam" had been wandering within a 70-degree range, but the abrupt jump in 37 days set a record.