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- astrophysics92
- astrophysics - high energy astrophysical phenomena48
- gamma ray bursts40
- fos: physical sciences32
- astrophysics::high energy astrophysical phenomena30
- astrophysics::cosmology and extragalactic astrophysics21
- galaxies20
- astrophysics - cosmology and nongalactic astrophysics19
- ultraviolet radiation19