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- 1m-widefield1
- absolute-magnitude9
- active galactic nuclei1
- active galaxies1
- active-galactic-nuclei8
- active-galaxies2
- astrometric-binary-stars1
- astrometric-microlensing-effect3
- astrometry21
- astronomical databases — surveys — catalogs — radio2
- astronomical-object-identification1
- astronomical-simulations2
- astrophotography6
- astrophysical-masers3
- asymptotic-giant-branch-stars3
- atomic-physics1
- binary-stars1
- bl lacertae1
- blazars5
- broad-band-photometry4