Pluto discovered at Lowell Observatory

  • Pluto discovered at Lowell Observatory
    Pluto discovered at Lowell Observatory
Thursday, February 18 The 49th day of the year 316 days left Today in History On this day in 1930, Pluto, once believed to be the ninth planet, is discovered at the Lowell Observatory in Flagstaff, Arizona, by astronomer Clyde W. Tombaugh. 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…

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