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Subject
- photometry6,218
- galaxies3,871
- optical astronomy3,435
- infrared photometry2,891
- surveys2,192
- spectroscopy2,069
- radio astronomy1,706
- redshifted1,595
- radial velocity1,567
- chemical abundances1,440
- wide-band photometry1,318
- x-ray sources1,292
- open star clusters1,278
- variable stars1,168
- infrared sources1,149
- galaxy clusters1,143
- infrared astronomy1,073
- radio sources990
- active galactic nuclei940
- quasars900