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- astronomy and astrophysics30
- space and planetary science30
- astrophysics28
- stars26
- astrophysics::solar and stellar astrophysics19
- astrophysics::earth and planetary astrophysics18
- astrophysics::galaxy astrophysics15
- astrophysics - solar and stellar astrophysics12
- astrophysics::cosmology and extragalactic astrophysics12