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Subject
- observational astronomy[remove]67
- galaxies32
- stars21
- galactic and extragalactic astronomy15
- nebulae12
- planets12
- optical astronomy11
- cosmology9
- solar system astronomy9
- stellar astronomy8
- ultraviolet astronomy8
- uv astronomy8
- optical astronomy7
- variable stars7
- uv5
- hot stars4
- infrared astronomy4
- white dwarfs4
- exoplanet astronomy3
- exoplanets3