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Subject
- galaxies[remove]9
- observational astronomy8
- galactic and extragalactic astronomy5
- optical astronomy4
- infrared astronomy3
- ultraviolet astronomy3
- galatic evolution2
- cosmology1
- dark matter1
- extra-galactic stars1
- galactic evolution1
- nebulae1
- planetary nebulae1
- planets1
- solar system astronomy1
- star formation1
- stars1
- stellar astronomy1
- stucture1
- supernovae1
