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- observational-cosmology7
- quasars6
- strong-gravitational-lensing6
- astrophotography5
- history-of-astronomy4
- surveys3
- active-galactic-nuclei2
- infrared-photometry2
- surface-photometry2
- active-galaxies1
- broad-band-photometry1
- catalogs1
- dwarf-galaxies1
- early-type-galaxies1
- flare-stars1
- galaxy-clusters1
- galaxy-distances1
- galaxy-evolution1
- galaxy-planes1
- jupiter-trojans1