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- and infrared astronomy1
- cosmology1
- dark matter1
- galactic and extragalactic astronomy8
- galactic evolution1
- galatic evolution3
- galaxies11
- galaxy evolution1
- galaxy evolution and structure1
- globular clusters1
- hubble space telescope observations1
- infrared astronomy4
- interacting galaxies1
- interstellar medium1
- merging galaxies1
- observational astronomy[remove]34
- optical1
- optical astronomy7
- optical astronomy10
- optical observations1