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Subject
- nebulae[remove]114
- photometry31
- h ii regions20
- infrared photometry19
- galaxies16
- spectroscopy16
- interstellar medium15
- magellanic clouds12
- observational astronomy12
- molecular clouds11
- optical astronomy11
- stars11
- infrared astronomy10
- infrared sources10
- young stellar objects10
- cosmology9
- planets9
- open star clusters8
- radio astronomy8
- surveys8