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Subject
- observational astronomy41
- galaxies20
- galactic and extragalactic astronomy15
- stars11
- optical astronomy10
- planets10
- cosmology9
- nebulae9
- solar system astronomy9
- stellar astronomy8
- optical astronomy7
- ultraviolet astronomy7
- uv4
- infrared astronomy3
- optical3
- and infrared astronomy2
- galatic evolution2
- star formation2
- dark matter1
- extra-galactic stars1