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Subject
- observational astronomy[remove]101
- surveys35
- galaxies32
- galactic and extragalactic astronomy21
- stars21
- nebulae12
- planets12
- solar system astronomy12
- stellar astronomy12
- optical astronomy11
- cosmology9
- ultraviolet astronomy8
- uv astronomy8
- optical astronomy7
- variable stars7
- uv5
- hot stars4
- infrared astronomy4
- white dwarfs4
- exoplanet astronomy3
