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- astrophysics47
- virtual observatory35
- fos: physical sciences21
- astrophysics - cosmology and nongalactic astrophysics17
- astrophysics::cosmology and extragalactic astrophysics17
- astrophysics (astro-ph)14
- astrophysics - instrumentation and methods for astrophysics12
- cosmic background radiation8
- astrophysics::instrumentation and methods for astrophysics7