NOTICE: This site is no longer being actively maintained
On October 1, 2019 NOAO joined with Gemini Observatory and Rubin Observatory operations to create a new organization, NSF’s NOIRLab. The content of this site is being migrated to our new domain: The public site has been launched and is the main web portal for the public and media. Many links on this site may redirect you to the new site. For now, scientists and astronomers can still find information about Kitt Peak, CTIO, and CSDC on the old site ( October 28, 2020

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Tourist Information

the constellation Orion over the Mayall Telescope at Kitt Peak at night.

Kitt Peak National Observatory
The world’s largest collection of optical telescopes is located high above the Sonoran Desert under some of the finest night skies in the world. Kitt Peak, on the Tohono O’odham Reservation, is home to twenty-five optical and two radio telescopes representing eight astronomical research institutions.

Media Visit Request Form

The Milky Way shines bright in the Chilean sky over Cerro Tololo.

Cerro Tololo Inter-american Observatory (en Español)
Visitas a CTIO. Información para visitar el Observatorio Interamericano Cerro Tololo.

If you are visiting Chile from the US and would like to arrange a visit to Cerro Tololo, please contact the English speaking receptionist by phone 011 56 51 205 200 to make a reservation for a Saturday tour. Tours may be booked up a month or more in advance and visitors need to arrange transportation separately.