For more than 60 years, Kitt Peak National Observatory has been the crown jewel of observatories in the southern United States, sitting atop the highest peak in the Quinlan Mountains southwest of Tucson.

KPNO, founded in 1958, which shares the 200-acre mountaintop site with the National Solar Observatory, operates three nighttime telescopes and hosts 22 optical telescopes and two radio telescopes.

KPNO was administered by the National Optical Astronomy Observatory from 1984-2019, when NOAO merged with two other observatories to form NOIRLab, the national center for ground-based, nighttime optical and infrared astronomy.