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Subject
- galaxy classification systems[remove]759
- galaxies529
- photometry300
- catalogs163
- optical astronomy156
- galaxy clusters134
- surveys115
- redshifted100
- infrared photometry70
- radio astronomy67
- infrared sources52
- sloan photometry52
- spectroscopy49
- radio galaxies47
- radial velocity46
- active galactic nuclei44
- radio sources43
- h i line emission35
- apparent magnitude33
- galaxy kinematics32
