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Subject
- ultraviolet sources[remove]25
- galaxies21
- surveys7
- x-ray sources5
- spectroscopy2
- ultraviolet astronomy2
- apparent magnitude1
- astronomical models1
- galaxy classification systems1
- globular star clusters1
- infrared astronomy1
- infrared sources1
- markarian galaxies1
- multiple stars1
- optical observation1
- photometry1
- quasars1
- radio astronomy1
- radio sources1
- redshifted / redshift1
