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Subject
- active galactic nuclei11
- astrometry3
- astronomical models2
- astronomical object identification2
- astrophysical masers[remove]220
- atomic physics1
- bl lacertae objects1
- black holes1
- catalogs1
- co line emission1
- early-type stars3
- exoplanets1
- extinction2
- galactic center2
- galaxies11
- galaxy classification systems1
- galaxy planes12
- galaxy rotation1
- giant stars14
- h i line emission1
