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- [sdu.astr]sciences of the universe [physics]/astrophysics [astro-ph]1
- active galactic nuclei1
- astrometry1
- astrophysics - cosmology and nongalactic astrophysics1
- astrophysics::cosmology and extragalactic astrophysics1
- astrophysics::earth and planetary astrophysics1
- astrophysics::galaxy astrophysics1
- astrophysics::solar and stellar astrophysics1
- billion years1