Mount Wilson (California) a new Mt. Wilson Hotel. In 1908 a 60-inch (1524 mm) telescope was completed at the summit, and in 1910 the Solar Tower was erected. In 1913 the hotel burned down and was replaced by a second hotel that lasted until its demolition in 1966. The Toll Road opened to automobiles in 1912 and lasted until 1936. In 1917, the 100-inch Hooker Telescope was completed and saw first light and would be the world's largest telescope until the opening of the 200-inch Hale Telescope at Palomar Observatory in 1948. In 1919, American astronomer Edwin Hubble arrived at Mt. Wilson and,
Discovery Channel Telescope Channel Telescope. When the comet approached Earth within 2.2 million miles (about 9 lunar distances), the size of the nucleus to be calculated to be 250 meters (820 feet) in diameter. The object was discovered by a PanSTARRS telescope, but not identified as a comet at that time. In 2017, DCT achieved 282 nights out of the year (365 days) of scheduled observations for science. At , the DCT is the fifth largest optical telescope in the continental United States, following the Hobby-Eberly Telescope segmented telescope, the Large Binocular Telescope twin telescopes, the MMT telescope, and the Hale telescope. Discovery