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Subject
- observational-cosmology7
- quasars6
- strong-gravitational-lensing6
- astrophotography5
- catalogs5
- surveys5
- active-galactic-nuclei4
- history-of-astronomy4
- spectroscopy3
- active-galaxies2
- infrared-photometry2
- surface-photometry2
- astronomical databases — surveys — catalogs — radio1
- broad-band-photometry1
- discrete-radio-sources1
- dwarf-galaxies1
- early-type-galaxies1
- flare-stars1
- galaxy-clusters1
- galaxy-distances1