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Subject
- absolute magnitude32
- accretion3
- active galactic nuclei291
- apparent magnitude70
- astrometry16
- astronomical models30
- astronomical object identification67
- astronomical reference materials5
- astrophysical masers2
- atomic physics2
- atomic spectroscopy3
- bl lacertae objects57
- black holes12
- catalogs166
- ccd photometry3
- chemical abundances55
- co line emission6
- diffuse molecular clouds1
- effective temperature1
- ephemerides2
