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- astronomy50
- astrophysics48
- fos: physical sciences22
- galaxies21
- astrophysics - instrumentation and methods for astrophysics19
- astrophysics - cosmology and nongalactic astrophysics16
- astrophysics - astrophysics of galaxies15
- instrumentation and photography15
- astrophysics::cosmology and extragalactic astrophysics14