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Subject
- supernova remnants[remove]100
- radio astronomy33
- radio sources21
- x-ray sources16
- galaxies15
- interstellar medium15
- photometry14
- milky way galaxy12
- optical astronomy12
- spectroscopy11
- h ii regions10
- gamma-ray astronomy8
- astronomical object identification7
- hst photometry7
- surveys7
- galaxy classification systems6
- radio continuum emission6
- co line emission5
- magellanic clouds5
- millimeter astronomy5
