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Subject
- photometry6,211
- galaxies3,828
- optical astronomy3,432
- infrared photometry2,891
- surveys2,103
- spectroscopy2,065
- radio astronomy1,706
- redshifted1,595
- radial velocity1,567
- chemical abundances1,440
- wide-band photometry1,318
- x-ray sources1,292
- open star clusters1,278
- variable stars1,156
- infrared sources1,149
- galaxy clusters1,139
- infrared astronomy1,040
- radio sources990
- active galactic nuclei939
- quasars895