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Subject
- galaxy clusters[remove]1,212
- photometry449
- galaxies441
- redshifted388
- optical astronomy217
- x-ray sources178
- spectroscopy142
- galaxy classification systems134
- radial velocity132
- surveys123
- redshifted / redshift101
- infrared photometry99
- galaxy kinematics91
- catalogs85
- radio astronomy80
- sloan photometry71
- radio sources58
- gravitational lensing49
- apparent magnitude48
- infrared sources45
