How a Trio of Observatories Around Tucson is Changing Astronomy

The “Tucson Triangle” is the greatest collection of scopes and spectrographs in the continental U.S.

Amid the burning Arizona sands, three peaks form a triangle of superlatives surrounding Tucson. Atop Mount Graham sits the world’s largest optical telescope. Mount Hopkins is home to North America’s second-largest single-mirror telescope. And Kitt Peak contains the continent’s largest single collection of mountaintop astronomical instruments. More Information.