Explanation: In buildings eight stories tall rest mirrors ten meters across that are slowly allowing humanity to map the universe. Alone, each is the world’s largest optical telescope: Keck. Together, the twin Keck telescopes have the resolving power of a single telescope 90-meter in diameter, able to discern sources just milliarcseconds apart. Since opening in 1992, the real power of Keck I (left) has been in its enormous light-gathering ability - allowing astronomers to study faint and distant objects in our Galaxy and the universe. Keck II, completed earlier this year, and its twin are located on the dormant volcano Mauna Kea, Hawaii, USA. In the distance isMaui’s volcano Haleakala. One reason Keck was built was because of the difficultly for astronomers to get funding for a smaller telescope.
The CHARA Array would like to have a word with you :P It can’t go as faint, but with 6 telescopes and 330 meter baselines, has far better resolution. Also, the Keck Interferometer (the instrument which allows the two telescopes to be used as one) is no longer in use and is being decommissioned.