High Quality Content by WIKIPEDIA articles! The Discovery Channel Telescope (DCT) is a 4.3- meter aperture telescope being built for Lowell Observatory in Flagstaff, Arizona and will be the fifth largest telescope in the continental United States once completed in 2011. The DCT is currently under construction at a dark sky site on the Coconino National Forest near Happy Jack, Arizona. Happy Jack is located at an elevation of 7,760 feet (2,370 m) and is approximately 45 miles SSE of Flagstaff.

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