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Subject
- star forming regions[remove]119
- photometry43
- infrared photometry34
- interstellar medium31
- optical astronomy29
- young stellar objects26
- radio astronomy22
- spectroscopy21
- galaxies17
- h ii regions17
- molecular clouds16
- infrared astronomy15
- millimeter astronomy15
- submillimeter astronomy15
- pre-main sequence stars12
- proper motions11
- stellar masses10
- stellar spectral types10
- infrared sources9
- radial velocity8
