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Wisconsin Man Builds Backyard Planetarium

Wisconsin Man Builds Backyard Planetarium
Frank Kovac, a paper-mill worker from Monico, Wis., spent 15 years building a planetarium in his backyard. The structure is 22 feet (6.7 meters) wide and weighs 2 tons (1,818 kilograms). (Image credit: Frank Kovac/Kovac Planetarium)

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