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Subject
- galaxies[remove]38
- observational astronomy32
- stars24
- galactic and extragalactic astronomy13
- nebulae12
- planets12
- variable stars11
- cosmology9
- exoplanet astronomy7
- exoplanets7
- solar system astronomy7
- stellar astronomy7
- hot stars4
- infrared astronomy4
- optical astronomy4
- ultraviolet astronomy4
- white dwarfs4
- galatic evolution3
- cool stars2
- supernovae2