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- astronomy and astrophysics27
- astrophysics::cosmology and extragalactic astrophysics26
- astrophysics::galaxy astrophysics26
- astrophysics::high energy astrophysical phenomena25
- space and planetary science20
- 01 natural sciences18
- 0103 physical sciences18
- 010303 astronomy & astrophysics18
- astrophysics - astrophysics of galaxies17