The W. M. Keck Observatory is an astronomical observatory with two telescopes at an elevation of 4,145 meters near the summit of Mauna Kea in the U.S. state of Hawaii. Both telescopes have 10 m aperture primary mirrors, and when completed in 1993 and 1996 were the largest optical reflecting telescopes in the world. They are currently the 3rd and 4th largest.
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Coordinates 19°49'33.956" N -155°28'29.263" E
