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- galactic and extragalactic astronomy[remove]13
- galaxies[remove]13
- observational astronomy12
- stars8
- cosmology7
- nebulae7
- planets7
- solar system astronomy7
- stellar astronomy7
- optical astronomy3
- infrared astronomy2
- ultraviolet astronomy2
- dark matter1
- exoplanet astronomy1
- galactic evolution1
- galatic evolution1
- star formation1
- supernovae1
- variable stars1