Ambartsumian’s Legacy and Active Universe

V.A.Ambartsumian: A Life in Science (the Editorial Board of the Journal Astrofizika and V.A.Ambartsumian Byurakan Astrophysical Observatory.- Plasma Diagnostic of Planetary Nebulae (A.F.Kholtygin).- On the Jubilee of Academician V.A.Ambartsumian Statistical Mechanics of Stellar Systems: From Ambartsumian Onward (L.P.Ossipkov).- Ambartsumian’s Methods in the Theory of Radiative Transfer (A.G.Nikoghossian).- Multiple Light Scattering: Mean Number of Scatterings and Related Problems (V.V.Ivanov).- Stellar Associations (A.T.Kalloghlian).- Star Formation and Molecular Clouds (A.L.Gyulbudaghian).- Ambartsumian’s Paradigm for the Activity of Galactic Nuclei and the Evolution of Galaxies (H.A.Harutyunian).- V.A.Ambartsumian and the Statistics of Flaring Objects (A.A.Akopian and E.S.Parsamian).- Rotating Superdense Configurations: Pulsars and Their Astrophysical Manifestations (D.M.Sedrakian and E.V.Chubarian).- Ambartsumian’s Concept of Active Galactic Nuclei (E.Ye. Khachikian).- Superdense Stars Containing Strange Baryons (Yu.L.Vartanyan).