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Subject
- absolute magnitude3
- active galactic nuclei5
- apparent magnitude3
- astronomical object identification1
- bl lacertae objects1
- catalogs1
- chemical abundances3
- galaxies14
- galaxy classification systems1
- galaxy clusters1
- gravitational lensing1
- h i line emission3
- hst photometry2
- infrared astronomy1
- infrared photometry1
- infrared sources1
- intergalactic medium[remove]31
- line intensities5
- milky way galaxy1
- optical astronomy20
