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Subject
- observational astronomy101
- galaxies38
- surveys35
- stars27
- galactic and extragalactic astronomy22
- nebulae12
- planets12
- solar system astronomy12
- stellar astronomy12
- variable stars12
- optical astronomy11
- ultraviolet astronomy10
- cosmology9
- exoplanets8
- optical astronomy8
- uv astronomy8
- exoplanet astronomy7
- hot stars5
- uv5
- infrared astronomy4
