The Smithsonian Astrophysical Observatory (SAO) is a "research institute" of the Smithsonian Institution. It is joined with the Harvard College Observatory (HCO) to form the Harvard-Smithsonian Center for Astrophysics (CfA). Because these research activities share Harvard and Smithsonian staff and resources, the links at this website will take you to information posted on the "CfA" pages.


Weekly Science Updates

October 11, 2013Don Quixote: An Asteroid that is a Living CometNear Earth Objects (NEOs) are asteroids or comets whose orbits sometimes bring them close to the earth's orbit. An NEO could therefore someday collide with the Earth -- giving them considerably more parochial interest than most objects in astronomy. Read More...
October 04, 2013Runaway Binary StarsCfA astronomers made a remarkable and fortuitous discovery in 2005: an extremely fast moving star, clocked going over three million kilometers an hour. Read More...

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