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- astrophysics - cosmology and nongalactic astrophysics87
- cosmic microwave background75
- astrophysics - instrumentation and methods for astrophysics65
- cosmic background radiation58
- astrophysics::cosmology and extragalactic astrophysics57
- astro-ph.co55
- fos: physical sciences51
- astronomical and space sciences44
- astrophysics::instrumentation and methods for astrophysics44