Quasars are believed to be powered by accretion of material into supermassive black holes in the nuclei of distant galaxies, making these luminous versions of the general class of objects known as active galaxies.
== Kasnejša zgodovina ==Anali Egejske vojvodine se v glavnem nanašajo na kronike družin Sanudo in Dandolo, Ghisi, Crispo in Sommaripa, Venier in Quirini ter Barozzi in Gozzadini.