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- galaxies[remove]32
- observational astronomy[remove]32
- stars19
- galactic and extragalactic astronomy12
- nebulae12
- planets12
- cosmology9
- solar system astronomy7
- stellar astronomy7
- variable stars6
- hot stars4
- infrared astronomy4
- optical astronomy4
- ultraviolet astronomy4
- white dwarfs4
- exoplanet astronomy3
- exoplanets3
- galatic evolution3
- cool stars2
- supernovae2