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Subject
- active galactic nuclei1
- apparent magnitude1
- astronomical object identification1
- catalogs1
- galaxies3
- galaxy clusters2
- globular star clusters2
- infrared photometry1
- observational astronomy2
- open star clusters4
- optical astronomy1
- photometry3
- pre-main sequence stars1
- seyfert galaxies1
- spectroscopy1
- surveys9
- x-ray binary stars3
- x-ray sources21
