Cerro Tololo Inter-American Observatory (CTIO) is a complex of astronomical telescopes and instruments located at 30.169 S, 70.804 W, approximately 80 km to the East of La Serena, Chile, at an altitude of 2200 meters. The complex is part of the National Optical Astronomy Observatory (NOAO) along with Kitt Peak National Observatory (KPNO) in Tucson, Arizona. The principal telescopes are the 4-m Victor M. Blanco Telescope and the 4.1-m Southern Astrophysical Research (SOAR) telescope, dedicated in April of 2004. The NOAO is operated by the Association of Universities for Research in Astronomy (AURA), which also operates the Space Telescope Science Institute and the Gemini Observatory. One of the two 8-m telescopes comprising the Gemini Observatory is co-located with CTIO on AURA property in Chile. The National Science Foundation (NSF) is the funding agency for NOAO. The Observatory headquarters are located in La Serena, Chile, about 300 miles north of Santiago..

[2]	Photo Gallery [2]
	Brief History of the Cerro Tololo Inter-American Observatory [3] Learn how CTIO came into being.
	Historical Highlights [4] CTIO historical highlights from 1958.
	Site Description [5] Details on the AURA site where Cerro Tololo is located.