Operating the 125-year-old Great Refractor telescope at Yerkes Observatory is no small feat. At 64 feet and 19 tons, the Great Refractor is so expertly balanced that it can be moved by hand. Find out how the Great Refractor works and learn more about the incredible history of Yerkes Observatory in Williams Bay, Wisconsin.

Photo Credit: Wikimedia Commons/Yerkes Observatory. Yerkes Messier 51 Canum Venaticorum 1902, G.W. Ritchey, Albert Einstein and Observatory staff in front of the 40-inch Refractor.

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