The Mount Wilson Observatory (MWO) is an astronomical observatory in Los Angeles County, California, United States. The MWO is located on Mount Wilson, a 5,710-foot (1,740-meter) peak in the San Gabriel Mountains near Pasadena, northeast of Los Angeles.
Looking down on the top of Mount Wilson, including the historic 100" Hooker telescope (center), the 60" telescope (center left), and the CHARA array