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Subject
- absolute magnitude2
- active galactic nuclei8
- apparent magnitude5
- astronomical object identification3
- astrophysical masers1
- atomic spectroscopy1
- catalogs32
- ccd photometry1
- chemical abundances10
- co line emission9
- diffuse molecular clouds7
- extinction2
- galactic center1
- galaxies178
- galaxy classification systems35
- galaxy clusters32
- galaxy kinematics3
- galaxy planes7
- galaxy rotation6
- h i line emission[remove]286
