What are these amazing phenomena, and how do they manifest? This is part of my complete intro Astronomy class that I taught at Willam Paterson University and CUNY Hunter. Active galactic nucleus: Quasar: Messier 87: Gamma Rays in Active Galactic Nuclei: Bremsstrahlung X-Rays: Synchrotron Radiation: Synchrotron Radiation: 0:00 Introduction 0:41 Discovery of Active Galaxies 4:04 Observations of Active Galaxies 7:28 Observations of Seyfert Galaxies 8:20 Normal Galactic Nuclei 12:55 Radio Galaxies 18:15 Radio Galaxy Lobes of Cygnus A 21:57 Active Radio Galaxy "Hercules A" 23:15 Synchrotron Emission of Radio Light 27:33 Radio Emission from M87 33:32 AGN are extra-luminous over all wavelengths 34:27 Centaurus A in Ultraviolet (GalEx Mission) 35:23 Centaurus A in X-Rays (Chandra Mission) 35:58 X-Rays from Inverse Compton Scattering 37:14 Active Galaxy Spectrum Schematic 37:53 Active Galactic Nuclei Spectra Explained 38:27 Active Galaxy Spectrum for NGC 1086 39:51 Active Galactic Nuclei Time Variations NGC 3783 41:36 Quasi-Stellar Radio Sources 42:33 Odd Spectra of Quasars Understood. 45:25 Quasars have strange spectra 48:01 Cosmic Beacons 49:11 HST Spies Galaxy-Quasar Connection in 1994 50:03 Quasars and Radio Lobes 50:26 Luminosity Ranges of Galaxies and Quasars 51:35 Galaxy Activity Compared.