Black-hole activity feedback across vast scales

Both observational and theoretical studies of black-hole activity or active galactic nucleus (AGN) feedback have been ongoing since the first indication supermassive black holes powering quasar in 1960s. Although several crucial astrophysical questions answered following decades, a number open problems remain, particular how AGN operates over nearly eight orders magnitude - from scales $\sim 10^{-3}\,{\rm pc}$ to galaxy-cluster few hundred kiloparsecs. At beginning June 2022, about 50 junior as well senior researchers met Brno for post-lockdown edition Cologne-Prague-Brno meeting try connect dots.