Subject
- galaxy clusters3
- photographic magnitude3
- redshifted / redshift3
- standard stars3
- trigonometric parallax3
- x-ray sources3
- asteroids2
- cataclysmic variable stars2
- effective temperature2
- galaxy classification systems2
- radio astronomy2
- radio sources2
- stellar distance2
- white dwarf stars2
- bl lacertae objects1
- chemical abundances1
- early-type stars1
- emission line stars1
- galaxy planes1
- h alpha photometry1
