The early universe was sizzling with active galactic nuclei (AGN) — intensely luminous cores powered by supermassive black holes — most of which could outshine their entire host galaxies and be seen across the observable universe. While our central supermassive black hole Sgr A* lies rather dormant at the moment, new evidence suggests that it too … Continue reading "Sgr A* Could Be a Relic of a Powerful AGN"