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- astrophysics - astrophysics of galaxies67
- astrophysics::cosmology and extragalactic astrophysics43
- astrophysics::high energy astrophysical phenomena40
- galaxies: active40
- astrophysics39
- astrophysics::galaxy astrophysics39
- fos: physical sciences38
- astrophysics - high energy astrophysical phenomena35
- astrophysics - cosmology and nongalactic astrophysics31