- AGN
- AGN
- Seyfert Galaxies
- 1908: E. Fath, 1943: C. Seyfert, Seyfert 1, Seyfert 2
- Jets
- 1918: H. Curtis, 1954: W. Baade and R. Minkowski
- Distances
- Schmidt 1963
- BL Lac objects
- BL Lac Objects
- Spectra
- Spectra, Spectral energy distribution
- Unification
- Unification
- Superluminal Motion
- Superluminal Motion
- AGN Summary
- AGN Summary
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