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Subject
- photometry64
- galaxies32
- globular star clusters17
- infrared photometry16
- ultraviolet photometry14
- redshifted13
- optical astronomy12
- magellanic clouds9
- variable stars8
- spectroscopy7
- wide-band photometry7
- galaxy classification systems6
- quasars6
- open star clusters5
- catalogs4
- galaxy clusters4
- hertzsprung russell diagram4
- ultraviolet astronomy4
- chemical abundances3
- line intensities3