translate English to German: Quasars appear to be a particular class of active galaxies , and a general consensus has emerged that in many cases it is simply the viewing angle that distinguishes them from other classes, such as (blazars and radio galaxies ). The huge luminosity of quasars is believed to be a result of friction caused by gas and dust falling into the accretion disks of supermassive black holes , which can convert about half of the mass of an object into energy as compared to a few percent for nuclear fusion processes.
Andere Astronomische Objekte , die in engem Zusammenhang mit Quasaren gesehen werden, sind aktive galaktische Kerne und Seyfertgalaxien.