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- cosmology8
- dark matter1
- exoplanet astronomy1
- galactic and extragalactic astronomy[remove]23
- galactic evolution1
- galatic evolution1
- galaxies14
- galaxy evolution and structure1
- infrared astronomy2
- interacting galaxies1
- merging galaxies1
- nebulae7
- observational astronomy22
- optical astronomy3
- planets7
- solar system astronomy11
- star formation2
- stars8
- stellar astronomy12
- supernovae1
