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- cosmology1
- dark matter1
- extra-galactic stars1
- galactic and extragalactic astronomy6
- galactic evolution1
- galatic evolution2
- galaxies9
- galaxy evolution1
- galaxy evolution and structure1
- globular clusters1
- infrared astronomy3
- nebulae1
- observational astronomy18
- optical astronomy4
- optical astronomy6
- planetary nebulae1
- planets1
- solar system astronomy2
- star formation1
- stars1
