Subject
- galaxy classification systems115
- milky way galaxy111
- variable stars101
- millimeter astronomy97
- radio continuum emission97
- submillimeter astronomy97
- radial velocity95
- proper motions93
- radio galaxies89
- redshifted / redshift80
- interstellar medium74
- chemical abundances67
- supernovae67
- apparent magnitude63
- h i line emission63
- line intensities58
- magellanic clouds57
- stellar distance56
- galaxy planes53
- stellar spectral types49
