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Subject
- galaxies[remove]20
- observational astronomy19
- galactic and extragalactic astronomy12
- planets10
- stars10
- cosmology9
- nebulae9
- solar system astronomy7
- stellar astronomy7
- optical astronomy4
- infrared astronomy3
- ultraviolet astronomy3
- galatic evolution2
- dark matter1
- extra-galactic stars1
- galactic evolution1
- planetary nebulae1
- star formation1
- stucture1
- supernovae1
