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Home The Hale Telescope is located on Palomar Mountain in San Diego County, California. (NASA/JPL-Caltech) The Hale Telescope is located on Palomar Mountain in San Diego County, California. (NASA/JPL-Caltech)

The Hale Telescope is located on Palomar Mountain in San Diego County, California. (NASA/JPL-Caltech)

The Hale Telescope is located on Palomar Mountain in San Diego County, California. (NASA/JPL-Caltech)

The Hale Telescope is located on Palomar Mountain in San Diego County, California. (NASA/JPL-Caltech)

Dedicated in 1948, the 200-inch Hale Telescope was the largest effective telescope in the world until 1993. (Caltech/Palomar)