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Subject
- active galactic nuclei8
- agn1
- astrophysical masers2
- atomic physics22
- black holes2
- carbon stars3
- chemical abundances8
- co line emission8
- comets7
- correlation2
- diffuse molecular clouds1
- early-type stars1
- emission line stars1
- galactic center1
- galaxies15
- galaxy classification systems1
- galaxy clusters3
- galaxy kinematics1
- galaxy planes4
- gamma-ray astronomy1
