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Subject
- active galactic nuclei1
- astronomical object identification2
- galaxies4
- galaxy planes1
- giant stars1
- globular star clusters1
- h ii regions2
- infrared astronomy12
- infrared photometry13
- infrared sources11
- late-type stars1
- magellanic clouds3
- milky way galaxy3
- millimeter astronomy1
- molecular clouds2
- morgan-keenan classification1
- observational astronomy1
- optical astronomy1
- photometry13
- planetary nebulae1