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Subject
- galaxy planes[remove]152
- milky way galaxy152
- surveys53
- radio astronomy48
- photometry45
- infrared photometry31
- radio sources22
- interstellar medium21
- millimeter astronomy18
- optical astronomy18
- submillimeter astronomy18
- h ii regions17
- infrared astronomy16
- infrared sources16
- molecular clouds15
- radio continuum emission13
- astrophysical masers12
- radial velocity11
- extinction9
- variable stars9
