Built by the University of Chicago in 1897 in Williams Bay, Wisconsin, Yerkes Observatory is home to the world’s largest refracting telescope and famous astronomers like George Ellery Hale, Edwin Hubble and Carl Sagan worked and studied there. ...as newer technology emerged the Great Refractor became less relevant, and the university closed the observatory in 2018. A non-profit formed by residents in the nearby Lake Geneva area took control, and in 2020 that group, Yerkes Future Foundation, embarked on a $20 million renovation effort.... Weighing about 82 tons, the Great Refractor is the world’s largest refracting telescope. The University of...