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Subject
- absolute magnitude11
- accretion2
- active galactic nuclei27
- apparent magnitude48
- astrometry13
- astronomical models14
- astronomical object identification19
- astronomical reference materials1
- bl lacertae objects1
- black holes1
- catalogs85
- ccd photometry36
- chemical abundances23
- co line emission8
- effective temperature1
- extinction5
- galaxies441
- galaxy classification systems134
- galaxy clusters[remove]1,212
- galaxy kinematics91
