Mount Wilson

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Wilson, Mount,

peak, 5,710 ft (1,740 m) high, S Calif., in the San Gabriel Mts., NE of Pasadena. It is the site of Mt. Wilson Observatory (est. 1904), one of the Hale Observatories. A 100-in. (254-cm) reflecting telescope there, no longer in use, was once the world's largest.