# Astrophysical research on black holes and galaxies > Live situation record from CLSTR: https://clstr.news/situations/astrophysical-research-on-black-holes-and-galaxies > Updated: 2026-09-19T07:00:48.000Z. Sources: 5. Developments: 2. Recent astrophysical research has provided new insights into the behavior of black holes and the composition of galaxies. Researchers have reconstructed a violent event involving the supermassive black hole RBH-1, which was likely ejected from its host galaxy due to a gravitational recoil of nearly 1,000 km/s caused by an asymmetrical merger of two spinning black holes. Additionally, observations of Cloud 9 suggest the existence of a galaxy containing hydrogen gas and dark matter but lacking stars. Further studies have identified a universal rule regarding black hole jet eruptions, often described as cosmic ‘burps’. Research indicates these eruptions occur when the accretion rate drops to 2% of the Eddington limit. This threshold appears consistent across various scales, from stellar-mass to supermassive black holes, explaining the timing of matter expulsion during tidal disruption events. ## Timeline ### 2026-09-19: Astrophysicists discover universal rule for black hole jet eruptions Researchers have discovered that black holes of all sizes launch powerful matter jets once their feeding rate drops to 2% of the Eddington limit, solving a long-standing cosmic mystery. 3 sources. https://clstr.news/cluster/astrophysicists-discover-universal-rule-for-black-hole-jet-eruptions ### 2026-09-04: Astronomers study black hole ejections and starless galaxies Astronomers reconstruct the violent ejection of a supermassive black hole via black hole mergers and investigate Cloud 9, a potential galaxy containing dark matter and gas but no stars. 2 sources. https://clstr.news/cluster/astronomers-study-black-hole-ejections-and-starless-galaxies --- Cite as: Astrophysical research on black holes and galaxies. CLSTR, https://clstr.news/situations/astrophysical-research-on-black-holes-and-galaxies