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Subject
- redshifted / redshift[remove]440
- galaxies195
- photometry160
- quasars110
- galaxy clusters101
- surveys80
- optical astronomy69
- catalogs68
- radio astronomy53
- spectroscopy52
- radio sources49
- active galactic nuclei46
- infrared photometry40
- infrared sources37
- sloan photometry37
- x-ray sources37
- line intensities32
- galaxy classification systems28
- apparent magnitude27
- radio galaxies23
