Final answer:
The Discovery Channel Telescope is situated near Flagstaff in the state of Arizona, which offers great conditions for astronomical observations due to its high altitude and low light pollution.
Step-by-step explanation:
The Discovery Channel Telescope is located near Flagstaff in Arizona. This state is known for its clear skies and minimal light pollution, which are ideal conditions for astronomical observations.
While the Sloan Digital Sky Survey telescope is found in New Mexico and the Allen Telescope Array in California, the Discovery Channel Telescope takes advantage of Arizona's unique geographical advantages, such as high altitude and dry climate, to provide excellent viewing conditions for astronomers and researchers.