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Subject
- a stars1
- absolute magnitude5
- accretion5
- active galactic nuclei50
- apparent magnitude6
- asteroids1
- astrometry5
- astronomical models7
- astronomical object identification10
- astronomical reference materials1
- atomic physics1
- atomic spectroscopy1
- b stars1
- be stars7
- bl lacertae objects4
- black holes3
- brown dwarfs5
- carbon stars7
- cataclysmic variable stars11
- catalogs17