A View Of The Slipher Rotunda Museum. Flagstaff, Arizona - November 25: Lowell Observatory On Mars Hill On November 25, 2011, In Flagstaff, Arizona. A National Historic Landmark Popular With Tourists, Lowell Observatory's Slipher Rotunda Museum Is An Astronomical Observatory In Flagstaff, Arizona, Where The Dwarf Planet, Pluto, Was Discovered By Clyde Tombaugh In 1930.

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