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Subject
- absolute magnitude2
- apparent magnitude2
- astronomical models2
- astronomical reference materials1
- catalogs12
- ccd photometry4
- extinction1
- galaxies45
- galaxy classification systems16
- galaxy clusters9
- globular star clusters5
- h alpha photometry1
- h ii regions1
- hst photometry3
- infrared astronomy2
- infrared photometry12
- infrared sources5
- interstellar medium1
- north galactic pole1
- optical astronomy9
