The only way to know for sure is to study galaxies far in the distant universe when the universe was young. Researchers say the change in properties could have been triggered by intense radiation emitted by the central black holes earlier. What is even more remarkable is that these ‘dying’ galaxies still host active supermassive black holes,” said Onoue. This discovery captures that process in action, providing a new clue to understanding the complex growth history of galaxies and black holes in the early Universe. Building on this discovery, the research team is continuing detailed analyses of the JWST data and planning future observations to further investigate the mysterious relationship between galaxies and black holes.