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- galactic and extragalactic astronomy[remove]16
- observational astronomy16
- galaxies12
- solar system astronomy9
- stellar astronomy9
- cosmology7
- nebulae7
- planets7
- stars7
- optical astronomy3
- infrared astronomy2
- ultraviolet astronomy2
- dark matter1
- galactic evolution1
- galatic evolution1
- galaxy evolution and structure1
- interacting galaxies1
- merging galaxies1
- star formation1
- supernovae1