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- cool stars2
- cosmology9
- exoplanet astronomy7
- exoplanets8
- galactic and extragalactic astronomy8
- galaxies24
- hot stars2
- interstellar medium1
- nebulae11
- observational astronomy21
- optical astronomy1
- planetary nebulae1
- planets12
- solar system astronomy7
- star formation1
- stars[remove]29
- stellar astronomy7
- stellar evolution1
- ultraviolet astronomy1
- uv astronomy1