Supermassive Black Holes Active Galactic Nuclei Accretion Disks Formation Galaxy Characteristics Formation of Galaxies Accretion Processes Galaxy Formation Overmassive Black Holes Galaxy Mergers Feedback Mechanisms Galaxy Interaction Big Bang Theory Effects on Galaxies Galaxy Dynamics Star Formation Black Hole Feedback Neutron Stars Gravitational Waves Eddington Limit Stellar-mass Black Holes Galactic Nuclei Formation and Behavior Intermediate Mass Black Holes Energy Sources Matter Interaction Black Hole Formation Primordial Black Holes Hawking Radiation Supernovae Cosmic Phenomena