World History Minute: The discovery of Pluto (Feb. 18, 1930) | WBEZ
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World History Minute: The discovery of Pluto (Feb. 18, 1930)

The former planet, Pluto, was discovered on Feb. 18, 1930 by Illinois-native Clyde W. Tombaugh. Historian John Schmidt will tell us about how Pluto was discovered,and explain why it was demoted to 'planetoid.' (Photo: Flickr/planetearth112)

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