Near which California city is Mount Wilson Observatory located?

Mount Wilson Observatory is located near Pasadena, California.

The observatory stands on Mount Wilson, a 1,740-metre peak in the San Gabriel Mountains of Los Angeles County, northeast of Los Angeles and near Pasadena. Its elevated location offered steadier air than the surrounding lowlands, making it exceptionally valuable for astronomical observation.

Mount Wilson became one of the most important astronomical sites of the twentieth century. The Carnegie Institution funded the observatory in 1904, and its 60-inch telescope began operating in 1908. The 100-inch Hooker telescope followed in 1917 and became the world’s largest telescope until 1949.

Using the Hooker telescope, Edwin Hubble established that Andromeda lies outside the Milky Way and later studied the relationship between galaxy distance and recessional velocity. Pasadena is the intended city answer; Berkeley, Santa Barbara, and San Diego are other California locations but do not identify the observatory’s nearby city.