Geek Fact for February 18th

In 1930, U.S. astronomer Clyde Tombaugh discovered Pluto.

The existence of an unknown ninth planet was first proposed by Percival Lowell, who theorized that wobbles in the orbits of Uranus and Neptune were caused by the gravitational pull of an unknown planetary body.

Learn more at http://www.history.com/this-day-in-history/pluto-discovered

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