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- absolute-magnitude2
- blazars2
- galaxies2
- galaxy-ages2
- galaxy-formation2
- galaxy-masses2
- galaxy-photometry2
- h-alpha-photometry2
- h-beta-photometry2
- infrared-photometry2
- interstellar-line-emission2
- radio-galaxies2
- spectropolarimetry2
- theoretical-models2
- dwarf-elliptical-galaxies1
- early-type-galaxies1
- galaxy-colors1
- perseus-cluster1
- surveys1
- x-ray-astronomy1