The Yerkes Observatory of the University of Chicago. The observatory was founded in 1897 by George Hale with a grant from businessman Charles Yerkes.

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The Yerkes Observatory of the University of Chicago. The observatory was founded in 1897 by George Hale with a grant from businessman Charles Yerkes. Seen here is the dome of the 40ins refractor telescope, the largest of its kind in the World. Yerkes Observatory is at Williams Bay, Wisconsin at an altitude of 334m.

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Photo credit: © PETER BASSETT/SCIENCE PHOTO LIBRARY / Alamy / Afripics
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Keywords: astronomy, astrophysics, observatory, optical, telescope, yerkes