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Subject
- a stars2
- absolute magnitude6
- accretion11
- active gal. nuclei1
- active galactic nuclei286
- apparent magnitude21
- astrometry10
- astronomical models15
- astronomical object identification134
- astronomical reference materials3
- astrophysical masers3
- atomic physics4
- be stars2
- bl lacertae objects56
- black holes6
- carbon stars1
- cataclysmic variable stars7
- catalogs43
- ccd photometry10
- chemical abundances13