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Subject
- a stars1
- active galactic nuclei6
- astronomical models3
- astronomical reference materials1
- astrophysical masers1
- atomic physics2
- carbon stars2
- catalogs5
- chemical abundances6
- co line emission[remove]179
- comets1
- emission line stars1
- extinction1
- galactic center1
- galaxies49
- galaxy classification systems1
- galaxy clusters8
- galaxy kinematics10
- galaxy planes5
- h alpha photometry2
