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- observational astronomy[remove]34
- galaxies11
- optical astronomy10
- galactic and extragalactic astronomy8
- ultraviolet astronomy8
- optical astronomy7
- infrared astronomy4
- galatic evolution3
- star formation3
- radio astronomy2
- supernovae2
- and infrared astronomy1
- cosmology1
- dark matter1
- galactic evolution1
- galaxy evolution1
- galaxy evolution and structure1
- globular clusters1
- hubble space telescope observations1
- interacting galaxies1