Smithsonian Astrophysical Observatory
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As a research institute of the Smithsonian Institution, the Smithsonian Astrophysical Observatory (SAO) is headquartered in Cambridge, MA, where it is joined with the Harvard College Observatory (HCO) to form the Harvard-Smithsonian Center for Astrophysics (CfA). More than 300 scientists at the CfA are engaged in a broad program of research in astronomy, astrophysics, earth and space sciences, and science education.





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Last modified: Nov. 28, 2025