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- astrophysics::high energy astrophysical phenomena4
- astrophysics3
- astrophysics::cosmology and extragalactic astrophysics3
- astrophysics::galaxy astrophysics3
- astrophysics::solar and stellar astrophysics3
- astronomy and astrophysics2
- astrophysics - high energy astrophysical phenomena2
- chandra x-ray observatory (u.s.)2
- emission-line galaxies2