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- galactic and extragalactic astronomy[remove]16
- observational astronomy15
- galaxies13
- solar system astronomy8
- stars8
- stellar astronomy8
- cosmology7
- nebulae7
- planets7
- optical astronomy3
- infrared astronomy2
- ultraviolet astronomy2
- variable stars2
- dark matter1
- exoplanet astronomy1
- galactic evolution1
- galatic evolution1
- galaxy evolution and structure1
- interacting galaxies1
- merging galaxies1