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Subject
- absolute magnitude41
- absolute-magnitude9
- accretion4
- active galactic nuclei272
- agn1
- apparent magnitude98
- astrometry40
- astronomical models37
- astronomical object identification75
- astronomical reference materials7
- astronomical-simulations1
- astrophysical masers10
- atomic physics2
- atomic spectroscopy4
- bl lacertae objects23
- black holes9
- carbon stars22
- catalogs703
- ccd photometry73
- chemical abundances235