America's oldest planetarium

When it first flicked on the projector lights in 1930, the Adler Planetarium in Chicago was the only one in the Western Hemisphere. At the time, planetariums themselves were only a 7-year-old invention imported from German lens grinders. But the American public's fascination with stars and distant worlds, it turned out, was skyrocketing. By 1934, the Adler had welcomed over a million visitors.
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