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- astrophysics - cosmology and nongalactic astrophysics95
- cosmic background radiation68
- astrophysics39
- fos: physical sciences37
- astrophysics::cosmology and extragalactic astrophysics35
- cosmology and nongalactic astrophysics (astro-ph.co)32
- redshift31
- astrophysics - instrumentation and methods for astrophysics30
- cosmic microwave background26