The CfA is a collaboration of Harvard College Observatory (HCO) and Smithsonian Astrophysical Observatory (SAO) and home to Harvard's Department of Astronomy.

News Releases

September 22, 2014

What is a planet? For generations of kids the answer was easy. A big ball of rock or gas that orbited our Sun, and there were nine of them in our solar system. But then astronomers started finding more Pluto-sized objects orbiting beyond Neptune.

September 10, 2014

Dr. Philip M. Sadler of the Harvard-Smithsonian Center for Astrophysics (CfA) has been awarded the 2014 Technology and Innovation Award from the International Planetarium Society.

Latest Science Update

September 26, 2014

There are 1822 confirmed exoplanets reported so far, and NASA's Kepler satellite has found evidence for more than two thousand others. Many exoplanets are expected to be in systems with multiple planets; indeed, one Kepler system is thought to contain seven or perhaps even more planets.

SI Specific Information

SI-specific information regarding the government shutdown may be found at alerts.si.edu. SAO staff are encouraged to review the website for updated information