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NASA Astrophysics - Science@NASA
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Astrophysics | Astronomy, Cosmic Objects, & Space | Britannica
What is Astrophysics? | Space
Theoretical Astrophysics and Cosmology | Physics Department
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Theoretical Astrophysics - Harvard–Smithsonian Center for Astrophysics
Astronomy and astrophysics - Latest research and news - Nature
HEASARC: NASA's Archive of Data on Energetic Phenomena