Percival Lowell1906
Percival Lowell starts an extensive project in search of a possible ninth planet, which he terms "Planet X"
United States · Science / Astronomy. Chronological records rendered directly from the World History Database.
Percival Lowell starts an extensive project in search of a possible ninth planet, which he terms "Planet X"
The search for Planet X resumes when the Lowell Observatory director, Vesto Melvin Slipher, summarily hands the job of locating Planet X to Clyde Tombaugh
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