In the unified model of active galaxies,the main difference among quasars,BL Lacertae objects,and radio galaxies appears to be that:

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The unified model suggests that all three types of active galaxies have a similar structure with a central supermassive black hole and an accretion disk, but the orientation of the disk relative to us is different in each case. BL Lacertae objects are seen face-on, radio galaxies are seen edge-on and quasars are seen at an intermediate angle. The rate of matter falling into the central black hole and the mass of the black hole may vary, but these are not the main differences between the types of active galaxies according to the unified model. The galaxy type with which they are associated is also not the main difference between them.

In the Unified Model of Active Galaxies,the Main Difference Among