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- astrophysics - high energy astrophysical phenomena117
- astrophysics::high energy astrophysical phenomena61
- astrophysics60
- galaxies: seyfert60
- astrophysics - astrophysics of galaxies58
- astrophysics::cosmology and extragalactic astrophysics57
- astrophysics::galaxy astrophysics57
- x-rays: galaxies56
- fos: physical sciences53