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| Acrecencia (Astrofísica) (1) |
| Galaxies: active (1) |
| Galaxies: nuclei (1) |
| Galaxies: Seyfert (1) |
| Quasars: individual (NGC 5548) (1) |
| Quasars: supermassive black holes (1) |
| Acrecencia (Astrofísica) (1) |
| Galaxies: active (1) |
| Galaxies: nuclei (1) |
| Galaxies: Seyfert (1) |
| Quasars: individual (NGC 5548) (1) |
| Quasars: supermassive black holes (1) |