The W. M. Keck Observatory is a two-telescope astronomical observatory 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 astronomical telescopes in the world. They are currently the 3rd and 4th largest telescopes.
The Mauna Kea Observatories (MKO) are a group of independent astronomical research facilities and large telescope observatories that are located at the summit of Mauna Kea on the Big Island of Hawaiʻ..
United Kingdom Infrared Telescope
W. M. Keck Observatory