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| | Astrophysics :: Physics |
 | | Astrophysics is the branch of astronomy that deals with the physics of the universe, including the physical properties (luminosity, density, temperature and chemical composition) of astronomical objects such as stars, galaxies, and the interstellar medium, as well as their interactions. |
 | | The study of cosmology is theoretical astrophysics at the largest scales. |
 | | Smithsonian Astrophysical Observatory: A research institute of the Smithsonian Institution headquartered in Cambridge, MA, where it is joined with the Harvard College Observatory (HCO) to form the Harvard-Smithsonian Center for Astrophysics (CfA). |
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