The Day Pluto Was Discovered, February 17, 1930
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YouTubeOnThisDayInScience
The Day Pluto Was Discovered, February 17, 1930
On February 17, 1930, astronomer Clyde Tombaugh identified Pluto using photographic plates at Lowell Observatory in Arizona. The discovery confirmed the long suspected “Planet X” beyond Neptune and expanded the known boundaries of the Solar System. Pluto remained classified as the ninth planet until 2006, when it was redefined as a dwarf ...
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