Season 32 Episodes13
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Yerkes Observatory, at Williams Bay near Chicago, is a most unusual place. Its main telescope is not a reflector, but a refractor - the world's largest Old-fashioned though it may look, Yerkes is in the forefront of scientific research, as Patrick Moore explains when
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"Yerkes Observatory" is episode 3 of The Sky at Night season 32. It aired on March 30, 1988.