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- astronomy and astrophysics22
- space and planetary science22
- astrophysics::cosmology and extragalactic astrophysics16
- astrophysics::galaxy astrophysics15
- stars14
- galaxy13
- astrophysics::earth and planetary astrophysics9
- astrophysics::solar and stellar astrophysics9
- astrophysics::high energy astrophysical phenomena8