Pluto discovered - Feb. 18, 1930

This Day in History Class - En podkast av iHeartPodcasts and HowStuffWorks

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On this day in 1930, junior astronomer Clyde Tombaugh discovered that Pluto was a planet. Learn even more about Pluto on the episode of Stuff You Missed in History Class, Pluto: The Demoted Dwarf Planet.

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