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- astrophysics - cosmology and nongalactic astrophysics46
- astrophysics - astrophysics of galaxies43
- gravitational lenses19
- galaxy clusters18
- astrophysics::cosmology and extragalactic astrophysics16
- astrophysics::galaxy astrophysics15
- gravitational lensing: strong15
- fos: physical sciences14
- galaxies: evolution13