The Keck Observatory telescopes are located at an elevation of more than 4000 meters (13,500 feet), far out in the Pacific on Mauna Kea. The Hale Telescope is located 80 kilometers (50 miles) northeast of San Diego, California, at an altitude of 1700 meters (5600 feet). What advantage do the Keck Observatory telescopes have compared to the Hale Telescope?
