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- galactic and extragalactic astronomy[remove]8
- observational astronomy[remove]8
- galaxies6
- optical astronomy3
- infrared astronomy2
- star formation2
- ultraviolet astronomy2
- cosmology1
- dark matter1
- galactic evolution1
- galatic evolution1
- galaxy evolution and structure1
- interacting galaxies1
- merging galaxies1
- supernovae1