Fast Radio Bursts Black Holes Auroral Phenomena Infrared Measurements Hydrogen Clouds Supermassive Black Holes Accretion Disks Magnetars Light and Wavelengths Galaxy Interactions Hypervelocity Stars Novas Comet Behavior Quasi-Periodic Eruptions Impact on Astronomy Galaxy Collisions Pulsational Pair Instability Coronal Mass Ejections Matter Shedding Long-Period Radio Transients Extragalactic Sources High-Energy Cosmic Events Radio Astronomy Neutrino Astronomy Tidal Disruption Events