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Subject
- young stellar objects[remove]532
- photometry264
- infrared photometry224
- infrared astronomy117
- molecular clouds104
- infrared sources96
- interstellar medium86
- optical astronomy77
- spectroscopy76
- pre-main sequence stars73
- millimeter astronomy71
- submillimeter astronomy71
- h ii regions66
- radio astronomy59
- stellar masses46
- stellar spectral types44
- x-ray sources39
- open star clusters38
- surveys38
- astronomical object identification35
