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Subject
- stars[remove]27
- galaxies24
- observational astronomy21
- planets12
- nebulae11
- cosmology9
- exoplanets8
- galactic and extragalactic astronomy8
- variable stars8
- exoplanet astronomy7
- solar system astronomy7
- stellar astronomy7
- cool stars2
- hot stars2
- white dwarfs2
- interstellar medium1
- optical astronomy1
- planetary nebulae1
- star formation1
- stellar evolution1
