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

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

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

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

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