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- and infrared astronomy2
- cosmology9
- dark matter1
- extra-galactic stars1
- galactic and extragalactic astronomy16
- galactic evolution1
- galatic evolution2
- galaxies20
- galaxy evolution1
- galaxy evolution and structure1
- globular clusters1
- infrared astronomy3
- interacting galaxies1
- interstellar medium1
- merging galaxies1
- nebulae9
- observational astronomy45
- optical3
- optical astronomy7
- optical astronomy10