The 200-inch Hale Telescope is a large optical telescope located at the Palomar Observatory in California. Completed in 1948, it was the largest telescope in the world for over four decades. The telescope's primary mirror measures 200 inches in diameter, allowing it to capture detailed images of celestial objects. Designed by astronomer George Ellery Hale, the telescope has contributed significantly to various fields of astronomy, including the study of galaxies, stars, and the solar system. Its advanced technology and large size have made it a vital tool for astronomers, helping to expand our understanding of the universe.