The Smithsonian Astrophysical Observatory (SAO) is a research institute of the Smithsonian Institution headquartered in Cambridge, Massachusetts, where it is joined with the Harvard College Observatory (HCO) to form the Harvard-Smithsonian Center for Astrophysics (CfA).

Contents 1 History 2 The SAO today 3 Directors 4 References 5 External links

[edit] History

The SAO was founded in 1890 by Samuel Pierpont Langley, the Smithsonian's third Secretary, primarily for studies of the sun.^[1] Langley is remembered today as an aeronautical pioneer, but he was trained as an astronomer and was the first American scientist to perceive "astrophysics" as a distinct field. Langley invented the bolometer and discovered infrared radiation from the sun.

In 1955, the SAO moved from Washington, D.C. to Cambridge, to affiliate with HCO and to expand its staff, facilities, and most importantly, its scientific scope. Fred Whipple, the first director of SAO in this new era, accepted a national challenge to create a worldwide satellite-tracking network, a decision that would establish SAO as a pioneer and leader in space science research.

In 1973, the ties between Smithsonian and Harvard were strengthened and formalized by the creation of the joint Harvard-Smithsonian CfA.

[edit] The SAO today

Currently, 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.

SAO's pioneering efforts in the development of orbiting observatories and large ground-based telescopes, the application of computers to astrophysical problems, and the integration of laboratory measurements, theoretical astrophysics, and observations across the electromagnetic spectrum have contributed much to our current understanding of the universe.

The Chandra X-ray Observatory is managed and operated by SAO from Cambridge. With the University of Arizona, SAO also manages the MMT Observatory.

[edit] Directors

• Samuel Pierpont Langley 1890-1906
• Charles Greeley Abbot 1906-1944
• Loyal B. Aldrich 1944-1955
• Fred Lawrence Whipple 1955-1973

[edit] References

[edit] External links

• SAO homepage
• Harvard-Smithsonian Center for Astrophysics

Coordinates: 42°22′53″N 71°07′42″W / 42.38146°N 71.12837°W / 42.38146; -71.12837