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- astrophysics - cosmology and nongalactic astrophysics53
- astrophysics - astrophysics of galaxies31
- astrophysics27
- fos: physical sciences18
- astrophysics - instrumentation and methods for astrophysics15
- astrophysics - solar and stellar astrophysics14
- hubble space telescope (spacecraft)12
- hubble constant11
- cosmology and nongalactic astrophysics (astro-ph.co)10