Finding Pluto—the hunt for Planet X

Friday, July 17, 2015 - 06:30 in Astronomy & Space

Our solar system's shadowy ninth (dwarf) planet was the subject of furious speculation and a frantic search for almost a century before it was finally discovered by Clyde Tombaugh in 1930. And remarkably, Pluto's reality was deduced using a heady array of reasoning, observation and no small amount of imagination.

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