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- Galaxies (12)
- Milky Way (3)
- Quasars (2)
- Stars (2)
- Astrophysics (1)
- Cosmic dust (1)
- Cosmology (1)
- Disks (Astrophysics) (1)
- Galaxies--Evolution (1)
- Interstellar matter (1)
- Molecular astrophysics (1)
- N stars (1)
- Red shift (1)
- Stars--Clusters (1)
- Stellar winds (1)
- Supernovae (1)