Yepun . ... Credit Copyright: European Southern Observatory Explanation: Pictured above on September 3rd, the enclosure for the 8.2 meter telescope christened Yepun glints dramatically in the light of the setting sun. ... Ultimately, the light from the three other 8.2 meter unit telescopes ( Antu, Kueyen, and Melipal ) will be combined with Yepun's to achieve an effective aperture of 16.4 meters -- creating the world's largest optical telescope . ... NASA Official: Jay Norris. ...