Category: Astronomy
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Happy Birthday, Pluto! (You’re Still Not a Planet, Though)
On February 18, 1930 a young astronomer named Clyde Tombaugh discovered a new object in the outer Solar System by examining photographic plates he had taken several weeks earlier. After a lot of discussion and suggestions, the name Pluto was selected for the new object, which was elevated to the status of the 9th planet…
Galileo's Pendulum 