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Subject
- photometry40
- galaxies25
- infrared photometry13
- optical astronomy9
- ultraviolet photometry8
- redshifted7
- globular star clusters6
- galaxy classification systems5
- variable stars5
- wide-band photometry5
- catalogs4
- open star clusters4
- galaxy clusters3
- magellanic clouds3
- pre-main sequence stars3
- spectroscopy3
- line intensities2
- quasars2
- stellar associations2
- surveys2