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Subject
- absolute magnitude1
- active galactic nuclei31
- apparent magnitude5
- astrometry3
- astronomical object identification6
- astrophysical masers2
- bl lacertae objects10
- catalogs8
- co line emission1
- galaxies158
- galaxy classification systems11
- galaxy clusters6
- gamma-ray astronomy2
- h i line emission12
- h ii regions3
- infrared astronomy4
- infrared photometry1
- infrared sources6
- interferometry7
- interstellar medium3