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  1. NASA Astrophysics - Science@NASA

  2. Astronomy & Astrophysics (A&A)

  3. Astrophysics - Wikipedia

  4. Astrophysics | Astronomy, Cosmic Objects, & Space | Britannica

  5. What is Astrophysics? | Space

  6. Theoretical Astrophysics and Cosmology | Physics Department

  7. Home | Center for Astrophysics | Harvard & Smithsonian

  8. Theoretical Astrophysics - Harvard–Smithsonian Center for Astrophysics

  9. Astronomy and astrophysics - Latest research and news - Nature

  10. HEASARC: NASA's Archive of Data on Energetic Phenomena