Keck Observatory is an astronomical observatory on Mauna Kea, a mountain on the island of Hawaii. The observatory consists of two identical telescopes, Keck I and Keck II, which are the largest optical telescopes in the world. Keck I was completed in 1992; Keck II, in 1996. The California Association for Research in Astronomy, which is a partnership of the University of California and the California Institute of Technology, operates the observatory. The facility's full name is the W. M. Keck Observatory.